DXi Software Interface

Overview

This topic provides software interface documentation for the following Quantum DXi Series models:

  • DXi4700
  • DXi4800
  • DXi6900
  • DXi9000
  • DXi9200
  • DXi T10

These models include the SCSI medium changer devices, SCSI tape drive devices.

This topic is designed for use by software engineers who have a basic understanding of Fibre Channel principles and technology.

This topic describes the software interfaces for all DXi Series devices which are available to host systems. Most DXi Series devices are emulations of actual devices. The systems that are not, are based on actual devices with only simple inquiry data changes. For ease of use, the software interface description specifies the deviations between the emulated device and the actual device. Citing only the deviations was necessary to keep the document to a reasonable size with so many devices available. Attempting to fully document all the features of the DXi Series devices would in essence be repeating the many actual product software interface guides. This was believed to be error prone and difficult to navigate. Therefore, for more complete explanations, it is recommended that a user also obtain the actual software interface guides for each of the DXi emulated devices which will be used. Together with both this guide and the actual software interface guide(s) the user should have sufficient documentation to interface to the DXi devices.

As noted in the specific deviations, not all features and commands for the DXi Series devices are emulated exactly. An attempt was made to emulate the necessary commands such that the DXi devices operate properly for host data applications such as backup, restore, and disaster recovery. There has been extensive testing using a wide range of host applications to insure that the emulations are compliant in this regard and that the deviations taken are appropriate.

The Quantum DXi Series devices take advantage of high speed hard disk drives to greatly reduce the time required for backup/restore functions and also improve confidence in completing the backup in the time allowed. The DXi Series device storage uses RAID technology to greatly enhance the reliability of this stored local data.

This topic uses the following conventions:

  • All binary numbers are succeeded by “b”
  • All hexadecimal numbers are succeeded by “h”
  • Error or attention conditions are represented in parenthesis that translate as follows:
(SK=S ASC=AA ASCQ=QQ)
where:
S = hexadecimal sense key value
AA = hexadecimal additional sense code
QQ = hexadecimal additional sense code qualifier

Emulated Quantum Medium Changer SCSI Command Deviations

This section documents the emulated Quantum medium changer SCSI command deviations. For a complete list of the Quantum medium changer SCSI commands, refer to the appropriate Quantum drive manual (see www.Quantum.com).

The following table provides general information about the emulated Quantum medium changer SCSI command deviations.

General Information

Number of Elements

Users can configure the number of Storage (i.e., Bin) Elements, Import/Export Elements, and Data Transfer (i.e., Tape Drive) Elements for each Library emulation. The valid element ranges may differ with each system model. The Emulated Media Changer Information table provides this data.

Note: These range limits do not match the actual libraries which are emulated and in most cases allow for a far greater number of elements. This is typically a useful feature since it then supports a far greater number of concurrent backup/restore jobs, which allows for higher throughputs and bandwidth utilization within the Storage Area Network (SAN).

Number of Tape Cartridge Media

Together with the larger number of available Storage and Import/Export elements, the user can configure a larger number of Tape Cartridge Media. By supporting more Tape Cartridge Media, this correlates to greater storage capacity than actual physical tape libraries.

Import/Export Elements

Some DXi configurations do not emulate an Import/Export Element. Because of this, a number of commands are affected. Command Read Element Status indicates a total of zero Import/Export Elements. Commands Prevent/Allow Medium Removal and Ready Import are unsupported and will return check condition (5h, 20h, and 0h).
Model Storage Elements Data Transport Elements Import/Export Elements
DX30 1280 30 0
DX100 5120 55 0
DX3000 800 32 0
DX5000 1600 64 0
DXi3500 1600 64 0
DXi4700 9000 32 240
DXi4800 61000 32 240
DXi5500 3200 64 0
DXi6700 9000 80 240
DXi6800 9000 80 240
DXi6900 9000 160 240
DXi7500 9000 160 240
DXi8500 9000 160 240
DXi9000 61000 512 240
DXi9200 61000 512 700
DXi T10 6100 32 240
Command Description
Initialize Element Status Implemented per specification.
Initialize Element Status with Range Implemented per specification.
Inquiry

Standard Page

  • Mchngr=0 - Indicating not an attached Medium Changer Device.
  • RMB=1 - Indicates medium is removable.
  • NORMACA or NACA=0 - Normal ACA is not supported on any Medium Changer emulations.
  • HiSup=1 - This aids in detection of large number of LUNs.

Vital Product Data Page 80h

Unit Serial Number - The serial number returned does not follow the actual serial number convention of an actual Quantum tape drive. However, it is a unique number consisting of letters and digits that is maintained in persistent system configuration.

Vital Product Data Page 83h

Device Identification Page - is supported. The following device descriptors are returned:

  • Code Set=2, Association=0, Identifier Type=1 (ASCII text comprised of the concatenation of VendorID, ProductID, and Serial Number for logical unit)
  • Code Set=1, Association=0, Identifier Type=0 (Binary data comprised of vendor specific information for logical unit)
  • Code Set=1, Association=1, Identifier Type=2 (Binary data comprised of EUI-64 bit assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=3 (Binary data comprised of NAA assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=4 (Binary data comprised of the relative target port ID)*

* if the device access is by means of a Fibre Channel interface, these descriptors are also returned.
Vendor ID Product ID Product Revision Notes
ADIC Pathlight VX 100A This is a pure Virtual Medium Changer.
ADIC Scalar 100 100A This is based on a Physical Medium Changer.
ADIC Scalar i500 100A This is based on a Physical Medium Changer.
ADIC Scalar i2000 120A This is based on a Physical Medium Changer.
ATL M2500 100A This is based on a Physical Medium Changer.
ATL P1000 6220050 100A This is based on a Physical Medium Changer.
ATL P7000 6438250 100A This is based on a Physical Medium Changer.
QUANTUM DX3000 6532501 100A This is a pure Virtual Medium Changer.
QUANTUM DX5000 6532502 100A This is a pure Virtual Medium Changer.
QUANTUM DXi4500 100A This is a pure Virtual Medium Changer.
QUANTUM DXi4601 100A This is a pure Virtual Medium Changer.
QUANTUM DXi4700 100A This is a pure Virtual Medium Changer.
QUANTUM DXi4800 100A This is a pure Virtual Medium Changer.
QUANTUM DXi6700 100A This is a pure Virtual Medium Changer.
QUANTUM DXi6800 100A This is a pure Virtual Medium Changer.
QUANTUM DXi6900 100A This is a pure Virtual Medium Changer.
QUANTUM DXi7500 100A This is a pure Virtual Medium Changer.
QUANTUM DXi8500 100A This is a pure Virtual Medium Changer.
QUANTUM PX500 100A This is based on a Physical Medium Changer.
QUANTUM PX720 100A This is based on a Physical Medium Changer.
QUANTUM Scalar i40-i80 120G This is based on a Physical Medium Changer.
QUANTUM Scalar i6000 605A This is based on a Physical Medium Changer.
QUANTUM DXi9000 100A This is a pure Virtual Medium Changer.
QUANTUM DXi9200 100A This is a pure Virtual Medium Changer.
QUANTUM DXi T10 100A This is a pure Virtual Medium Changer.
Command Description
Log Sense
  • PPC=0 - Parameter pointer control must be 0h.
  • SP=0 - Does not support saving log parameters
  • PC=1 - only returns cumulative values for any log parameter.

See Log Sense-Log Pages.
Log Page Supported
00h - List of Supported Pages Yes
07h - Last n Errors Events No

2Eh - Tape Alert

Parameter alerts 1-64 always return 0h (condition has not occurred)

 Yes

30h - Medium Changer Statistics

 No
31h - System Monitoring No
32h - Drive Raw Status No
33h - Elements Statistics No
34h - Scan Retries No
36h - Extended Element Statistics No
3Eh - Device Status No
Mode Page Supported

02h - Disconnect/Reconnect

No
18h - Fibre Channel Logical Unit Control No
19h - Fibre Channel Port Control No

1Ch - Informational Exceptions Control

 Yes

1Dh - Element Address Assignment

As noted under the General Information section, the number of elements may not match an actual Tape Library. Usually, a far greater number is supported.

 Yes
1Eh - Transport Geometry Parameters Yes
1Fh - Device Capabilities Yes
Command Description
Mode Select 10

Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Mode Sense 6

Mode pages supported in Mode Select are also supported in Mode Sense (see Mode Select 6/10-Mode Pages).

  • Page Code 00h - No requested page (i.e., no page data returned).
  • Page Code 03Fh - Return all pages - Implemented per specification.
Mode Sense 10 Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Move Medium Implemented per specification.
Persistent Reserve In Not supported. Returns check condition unsupported command (5h, 20h, 0h).
Persistent Reserve Out Not supported. Returns check condition unsupported command (5h, 20h, 0h).
Position to Element Implemented per specification.
Prevent/Allow Medium Removal

Any initiator issuing this command to allow medium removal (Prevent=00b) will allow medium removal for all initiators.

  • Prevent=00b - Allows medium removal - implemented per specification.
  • Prevent=01b - Prohibit medium removal - implemented per specification.
  • Prevent=10b - Not supported, returns check condition (5h,24h,0h).
  • Prevent=11b - Not supported, returns check condition (5h,24h,0h).
Read Buffer Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Read Element Status Implemented per specification.
Ready Import Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Release 6 Only Unit Reservations are supported. Element and Reservation ID Fields must be 0. Third Party Reservations are not supported. A Third Party Device ID field must be 0.
Release 10 Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Report Device Identifier A3h, (05h) Not supported. Returns check condition unsupported command (5h, 20h, 0h).
Report LUNS Implemented per specification.
Request Sense Implemented per specification.
Request Volume Element Address Not supported. Returns check condition unsupported command (5h, 20h, 0h).
Reserve 6 Only Unit Reservations are supported. Reservation ID fields must be 0. Third Party Reservations are not supported. Third Party Device ID fields must be 0.
Reserve 10 Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Send Diagnostic
  • SelfTst=0 - Self-Test Codes: 00h-07h: returns status GOOD if parameter list length=0h.
  • SelfTst=1 - Self-Test Codes: 00h-07h: returns status GOOD if parameter list length=0h
Send Volume Tag Command not supported. Returns check condition unsupported command (5h, 20h, 0h).
Set Device Identifier A4h, (06h) Not supported. Returns check condition unsupported command (5h, 20h, 0h).
Test Unit Ready Implemented per specification.
Write Buffer Command not supported. Returns check condition unsupported command (5h, 20h, 0h).

Emulated Quantum Tape Drive SCSI Command Deviations

This section documents the emulated Quantum tape drive SCSI command deviations. For a complete list of the Quantum tape drive SCSI commands, refer to the appropriate Quantum drive manual (see www.Quantum.com).

This section documents where the DXi Series system deviates from an actual Quantum tape drive. For a complete list of the Quantum tape drive SCSI commands, refer to the appropriate Quantum tape drive manual.

The following table provides general information about the emulated Quantum tape drive SCSI command deviations.

General Information

Tape Cartridge Capacity

The DXi DLT/SDLT tape cartridge capacity may not necessarily match an actual DLT/SDLT tape cartridge. The user is given the option when creating cartridges to set the capacity depending on the DXi system configuration.

Note: The tape directory for a virtual tape cartridge is limited to a maximum of 32,000 entries. Entries in both Filemarks and Datablocks contribute to this maximum. Writing data with non-fixed block sizes can exhaust the number of available entries.

MAM (Medium Auxiliary Memory) support

Cartridge MAM is supported. All media will indicate Medium Manufacturer Attribute as Quantum (0x400). All media will indicate Medium Serial Number Attribute (0x401) as blank.

The DLT7000 emulated tape drive does not support MAM. Also, the emulated DLT IV tape medium does not support MAM. This matches the behavior of an actual DLT7000 tape drive and DLT IV medium. For the DLT7000, the Read Attribute and Write Attribute commands will return unsupported command check condition (5h, 20h, 0h).

Tape Drive Compression

When the tape drive is enabled for compression, depending on the system configuration, the data may not actually be compressed.

FC versus SCSI interface

Where there are different settings/responses which are interface specific, the DXi Series emulates Fibre Channel setting/response.

WORM Cartridges

WORM (Write Once Read Many) Cartridge Type is not supported in the DXi product. Although, the tape drive emulation will indicate that it has WORM support, no such cartridge types can ever be created in the DXi system.
Erase

Implemented per specification.

Note: The data on the emulated tape cartridge is not physically erased. The tape cartridge directory information is reset to indicate an empty tape cartridge.
Inquiry

Standard Page

  • HiSup=1 - this aids in detection of large number of LUNs.
  • Product Revision. Refer to the following table for product revisions for actual Quantum tape drives which enjoy wide popularity.
Vendor ID Product ID Product Revision
QUANTUM DLT7000 276B
QUANTUM SDLT320 505D
QUANTUM SDLT600 292C
QUANTUM DLT-S4 1428
Vital Product Data Page 80h - Unit Serial Number - The serial number returned does not follow the actual serial number convention of an actual Quantum tape drive; however, it is a unique number consisting of letters and digits that is maintained in persistent system configuration.

Vital Product Data Page 83h - Device Identification Page - is supported. The following device descriptors are returned:

  • Code Set=2, Association=0, Identifier Type=1 (ASCII text comprised of the concatenation of VendorID, ProductID, and Serial Number for logical unit)
  • Code Set=1, Association=0, Identifier Type=0 (Binary data comprised of vendor specific information for logical unit) Code Set=1, Association=1, Identifier Type=2 (Binary data comprised of EUI-64 bit assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=3 (Binary data comprised of NAA assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=4 (Binary data comprised of the relative target port ID)*

* if the device access is by means of a Fibre Channel interface, these descriptors are also returned.
VPD=1, Inquiry Pages DLT7000 Support SDLT320 Support SDLT600 Support DLT-S4 Support
00h - List of Supported Pages Yes Yes Yes Yes
80h - Unit Serial Number Yes Yes Yes Yes
83h - Device Identification Yes Yes Yes Yes
B0h - Sequential Access Device Capabilities N/A N/A N/A Yes
B1h - Manufacturer assigned Serial Number N/A N/A N/A Yes
C0h - Drive Component Revision Page Firmware (Vendor Specific) Yes Yes Yes Yes
C1h - Drive Component Revision Page Hardware (Vendor Specific) No Yes Yes Yes
Command Description
Load Unload Implemented per specification.
Locate Implemented per specification.
Log Select Only pages supported in Log Sense will have the capability to be reset.
Log Sense See Log Sense-Log Pages.
Log Page DLT7000 Support SDLT320 Support SDLT600 Support DLT-S4 Support
00h - List of Supported Pages Yes Yes Yes Yes

02h - Write Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

Yes Yes Yes Yes

03h - Read Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

Yes Yes Yes Yes
07h - Last n Errors Events No No No No
0Ch - Sequential Access Device N/A N/A No No
0Dh - Temperature N/A No No No
18h - Protocol Specific N/A N/A N/A No

2Eh - Tape Alert

Parameter alerts 1-64 always return 0h (condition has not occurred)

Yes Yes Yes Yes
32h - Data Compression Yes Yes Yes Yes
33h - Device Wellness No No No No
38h - General Purpose Non-Volatile N/A N/A N/A No
3Eh - Device Status No No No No
Mode Page DLT7000 Support SDLT320 Support SDLT600 Support DLT-S4 Support

01h - Read-Write Recovery

Field PER may be changed by has no effect on the tape drive emulation operation.

Yes Yes Yes Yes

02h - Disconnect/Reconnect

Fields Maximum Burst Size and DTDC may be changed by have no effect on the tape drive emulation operation.

Yes Yes Yes Yes

0Ah - Control Mode

Field RLEC may be changed but has no effect on the tape drive emulation operation.

Yes Yes Yes Yes
0Fh - Data Compression Yes Yes Yes Yes

10h - Device Configuration

Fields SEW, Write Delay Time, and Select Data Compression Algorithm may be changed but has no effect on the tape drive emulation operation.

Yes Yes Yes Yes
11h - Medium Partition Yes Yes Yes Yes
18h - (Protocol Specific) Logical unit Control N/A No No No
19h - (Protocol Specific) Port Control N/A No No No

1Ch - Information Exception Control

Fields DExcpt and Test may be changed but have no effect on tape drive emulation operation.

 Yes Yes Yes Yes
Vendor Specific Configuration N/A No No No
27h - Data Security N/A N/A N/A No
3Ch - Disaster Recovery N/A No No No
3Eh - EEPROM No No No No
Command Description
Mode Sense 6 / 10

Mode pages supported in Mode Select are also supported in Mode Sense (see Mode Select 6/10-Mode Pages).

  • Page Code 00h - No requested page (i.e. no page data returned).
  • Page Code 03Fh - return all pages - Implemented per specification.
Persistent Reserve In
  • Code 00h Read Keys - implemented per specification
  • Code 01h Read Reservation - implemented per specification
  • Code 02h Report Capabilities - Persistent Reservation Types EX_AC (Exclusive Access) and EX_AC_RO (Exclusive Access - Registrants Only) are supported.
  • Code 03h Read Full Status - is not supported.
Persistent Reserve Out
  • Codes 00h-06h - implemented per specification
  • Code 07h - Register and Move - is not supported.
Prevent / Allow Medium Removal Implemented per specification.
Read Implemented per specification.
Read Attribute Implemented per specification.
Read Block limits Maximum Transfer Size is 200000h (i.e. 2 MB).
Read Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Read Position Partition Number, Number of objects and bytes in the buffer are always return as 0.
Receive Diagnostics
  • PVC=1, Page Code 00h, Supported Page List - indicates that no other Diagnostic Pages are supported.
  • PVC=0, returns a hard coded Diagnostic Report Page of length 6 bytes with values of: 01h, 00h, 01h, 00h, 01h, 00h
Release Unit 6/10 For Release 10, parameter list value should be < = 255, otherwise returns check condition, parameter not supported (5h, 26h, 1h).
Report Density Support Implemented per specification.
Report Device Identifier A3h, (05h) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Report LUNS Implemented per specification.
Report Supported Opcodes A3h, (0Ch)
  • SDLT600, DLT-S4 - Implemented per specification.
  • DLT7000, SDLT320 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models of DLT7000 and SDLT320 do not support this OpCode in compliance with their reported support of T10 SPC.
Report Supported Task Management Functions A3h, (0Dh)
  • SDLT600, DLT-S4 - Implemented per specification.
  • DLT7000, SDLT320 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models of DLT7000 and SDLT320 do not support this OpCode in compliance with their reported support of T10 SPC.
Report Timestamp A3h, (0Fh) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Request Sense Implemented per specification.
Reserve Unit 6/10 For Reserve 10, parameter list value should be < = 255, otherwise returns check condition, parameter not supported (5h, 26h, 1h).
Rewind Implemented per specification.
Send Diagnostics

SelfTst=0

Self-Test Code - 00h is supported.
Self-Test Codes - 01h, 02h, 04h, 05h, 06h return status GOOD if parameter list length is 0.

SelfTst=1

Self-Test Code - 00h is supported.
Self-Test Codes - 01h-07h are not supported and returns check condition (05h, 24h, 00h).
Set Device Identifier A4h, (06h) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Set Timestamp A4h, (0Fh) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Space Implemented per specification.
Test Unit Ready Implemented per specification.
Verify Implemented per specification.
Write Implemented per specification.
Write Attribute Implemented per specification.
Write Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Write Filemarks Implemented per specification.

This section documents where the DXi Series system deviates from an actual Quantum LTO tape drive. For a complete list of the Quantum LTO SCSI commands, refer to the appropriate Quantum LTO tape drive manual.

The following table provides general information about the emulated Quantum (Certance) LTO SCSI command deviations.

General Information

Tape Cartridge Capacity

The DXi LTO tape cartridge capacity may not necessarily match an actual LTO tape cartridge. The user is given the option when creating cartridges to set the capacity depending on the DXi system configuration.

MAM (Medium Auxiliary Memory) support

Cartridge MAM is supported. All media will indicate Medium Manufacturer Attribute as Quantum (0x400). All media will indicate Medium Serial Number Attribute (0x401) as blank.

Tape Drive Compression

When the tape drive is enabled for compression, depending on the system configuration, the data may not actually be compressed. FC versus SCSI versus SAS interface – Where there are different settings/responses which are interface specific, the DXi Series emulates Fibre Channel setting/response.

WORM Cartridges

WORM (Write Once Read Many) Cartridge Type is not supported in the DXi product. Although, the tape drive emulation will indicate that it has WORM support, no such cartridge types can ever be created in the DXi system.

Encryption/Decryption

The later model LTO drive types have the capability to encrypt data as it is written to tape medium and decrypt it when reading this data back. This feature is not emulated.

Multiple Partitions

Multiple partitions are not supported for any Tape Drive Types.
Erase

Implemented per specification.

Note: The data on the emulated tape cartridge is not physically erased. The tape cartridge directory information is reset to indicate an empty tape cartridge.
Inquiry

Standard Page

HiSup=1 - this aids in detection of large number of LUNs.
Product Revision. Refer to Standard Page Product Revision for product revisions for actual Certance tape drives which enjoy wide popularity.
Vendor ID Product ID Product Revision
CERTANCE ULTRIUM 2 1880
CERTANCE ULTRIUM 3 1856
Vital Product Data Page 80h - Unit Serial Number - The serial number returned does not follow the actual serial number convention of an actual Quantum tape drive; however, it is a unique number consisting of letters and digits that is maintained in persistent system configuration.

Vital Product Data Page 83h - Device Identification Page - is supported. The following device descriptors are returned:

  • Code Set=2, Association=0, Identifier Type=1 (ASCII text comprised of the concatenation of VendorID, ProductID, and Serial Number for logical unit)
  • Code Set=1, Association=0, Identifier Type=0 (Binary data comprised of vendor specific information for logical unit)
  • Code Set=1, Association=1, Identifier Type=2 (Binary data comprised of EUI-64 bit assigned identifier for target port)* Code Set=1, Association=1, Identifier Type=3 (Binary data comprised of NAA assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=4 (Binary data comprised of the relative target port ID)*

* if the device access is by means of a Fibre Channel interface, these descriptors are also returned.
VPD=1, Inquiry Pages Support LTO-2 Support LTO-3
00h - List of Supported Pages Yes Yes
80h - Unit Serial Number Yes Yes
83h - Device Identification Yes Yes
B0h - Sequential Access Device Capabilities N/A Yes
C0h - Drive Component Revision Page Firmware Yes Yes
C1h - Drive Component Revision Page Hardware Yes Yes
C2h - Drive Component Revision Yes Yes
C3h - Drive Component Revision Yes Yes
C4h - Drive Component Revision Yes Yes
C5h - Drive Component Revision Yes Yes
C6h - Drive Component Revision Yes Yes
DFh - Drive Status Yes Yes
Command Description
Load Unload Implemented per specification.
Locate Implemented per specification.
Log Select Only pages supported in Log Sense will have the capability to be reset.
Log Sense See Log Sense-Log Pages.
Log Page Support LTO-2 Support LTO-3
00h - List of Supported Pages Yes Yes

02h - Write Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

Yes Yes

03h - Read Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

Yes Yes
0Ch - Sequential Access Device N/A N/A
14h - Device Statistics No No
16h - Diagnostic Data No No

2Eh - Tape Alert

Parameter alerts 1-64 always return 0h (condition has not occurred)

Yes Yes
30h - Tape Usage No No
31h - Tape Capacity Yes Yes
32h - Data Compression Yes Yes
33h - Error Events No No
3Eh - Device Status Yes Yes
Mode Page Support LTO-2 Support LTO-3

02h - Disconnect/Reconnect

Fields Maximum Burst Size and DTDC may be changed by have no effect on the tape drive emulation operation.

 Yes Yes

0Ah - Control Mode

Field RLEC may be changed but has no effect on the tape drive emulation operation.

Yes Yes
0Fh - Data Compression Yes Yes

10h - Device Configuration

Fields SEW, Write Delay Time, and Select Data Compression Algorithm may be changed but has no effect on the tape drive emulation operation.

Yes Yes

1Ch - Information Exception Control

Fields DExcpt and Test may be changed but have no effect on tape drive emulation operation.

Yes Yes
1Dh - Medium Configuration N/A Yes
21h - Drive Capabilities Control No No
Command Description
Mode Sense 6 / 10

Mode pages supported in Mode Select are also supported in Mode Sense (see Mode Select 6/10-Mode Pages).

  • Page Code 00h - No requested page (i.e., no page data returned).
  • Page Code 03Fh - return all pages - Implemented per specification.
Persistent Reserve In
  • Code 00h Read Keys - implemented per specification
  • Code 01h Read Reservation - implemented per specification
  • Code 02h Report Capabilities - Persistent Reservation Types EX_AC (Exclusive Access) and EX_AC_RO (Exclusive Access - Registrants Only) are supported.
  • Code 03h Read Full Status - is not supported.
Persistent Reserve Out
  • Codes 00h-06h - implemented per specification
  • Code 07h - Register and Move - is not supported.
Prevent / Allow Medium Removal Implemented per specification.
Read Implemented per specification.
Read Attribute Implemented per specification.
Read Block limits Maximum Transfer Size is 200000h (i.e., 2 MB).
Read Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Read Position Partition Number, Number of objects and bytes in the buffer are always return as 0.
Receive Diagnostics
  • PVC=1, Page Code 00h, Supported Page List - indicates that no other Diagnostic Pages are supported.
  • PVC=0, returns a hard coded Diagnostic Report Page of length 6 bytes with values of: 01h, 00h, 01h, 00h, 01h, 00h
Release Unit 6/10 For Release 10, parameter list value should be < = 255, otherwise returns check condition, parameter not supported (5h, 26h, 1h).
Report Density Support Implemented per specification.
Report Device Identifier A3h, (05h) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Report LUNS Implemented per specification.
Report Supported Opcodes A3h, (0Ch)
  • Certance LTO3 - Implemented per specification.
  • Certance LTO2 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive model Certance LTO2 does not support this OpCode in compliance with its reported support of T10 SPC.
Report Supported Task Management Functions A3h, (0Dh)
  • Certance LTO3 - Implemented per specification.
  • Certance LTO2 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive model Certance LTO2 does not support this OpCode in compliance with its reported support of T10 SPC.
Request Sense Implemented per specification.
Reserve Unit 6/10 For Reserve 10, parameter list value should be < = 255, otherwise returns check condition, parameter not supported (5h, 26h, 1h).
Rewind Implemented per specification.
Send Diagnostics

SelfTst=0

Self-Test Code - 00h is supported.
Self-Test Codes - 01h, 02h, 04h, 05h, 06h return status GOOD if parameter list length is 0.

SelfTst=1

Self-Test Code - 00h is supported.
Self-Test Codes - 01h-07h are not supported and returns check condition (05h, 24h, 00h).
Set Device Identifier A4h, (06h) Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Space Implemented per specification.
Test Unit Ready Implemented per specification.
Verify Implemented per specification.
Write Implemented per specification.
Write Attribute Implemented per specification.
Write Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Write Filemarks Implemented per specification.

Emulated HP Tape Drive SCSI Command Deviations

This section documents the emulated HP tape drive SCSI command deviations. For a complete list of the HP LTO tape drive SCSI commands, refer to the appropriate HP drive manual (see www.hp.com).

General Information

Tape Cartridge Capacity

The DXi LTO tape cartridge capacity may not necessarily match an actual LTO tape cartridge. The user is given the option when creating cartridges to set the capacity depending on the DXi system configuration.

Note: The tape directory for a virtual tape cartridge is limited to a maximum of 32,000 entries. Entries in both Filemarks and Datablocks contribute to this maximum. Writing data with non-fixed block sizes can exhaust the number of available entries.

Tape Drive Compression

When the tape drive is enabled for compression, depending on the system configuration, the data may not actually be compressed.

MAM (Medium Auxiliary Memory) support

Cartridge MAM is supported. All media will indicate Medium Manufacturer Attribute as Quantum (0x400). All media will indicate Medium Serial Number Attribute (0x401) as blank.

Fibre Channel vs. SCSI vs. SAS Interface

Where there are different settings/responses which are interface specific, the DXi Series emulates the Fibre Channel setting/response.

WORM Cartridges

WORM (Write Once Read Many) Cartridge Type is not supported in the DXi product. Although, the tape drive emulation will indicate that it has WORM support, no such cartridge types can ever be created in the DXi system.

Encryption/Decryption

The later model LTO drive types have the capability to encrypt data as it is written to tape medium and decrypt it when reading this data back. This feature is not emulated.

Multiple Partitions

Multiple partitions are not supported for any Tape Drive Types.
Maintenance In- Vendor Unique: A3h, (1Fh) A number of vendor unique commands are based off this OpCode (Service Action) yet none of them are supported. Returns check condition, invalid CDB field (5h, 24h, 0h).
Maintenance Out - Vendor Unique: A4h, (1Fh) A number of vendor unique commands are based off this OpCode (Service Action) yet none of them are supported. Returns check condition, unsupported command (5h, 20h, 0h).
Allow Overwrite: 82h Command is not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Erase

Setting “Long” does not over write the entire tape cartridge data area with Data Set Separators.

Note: The data on the emulated tape cartridge is not physically erased. The tape cartridge directory information is reset to indicate an empty tape cartridge.
Inquiry

Standard Page

HiSup=1 - this aids in detection of large number of LUNs.
Product Revision. See Inquiry-Standard Page for product revisions for actual Certance tape drives which enjoy wide popularity.
Vendor ID Product ID Product Revision
HP Ultrium 1-SCSI E38W
HP Ultrium 2-SCSI S53Z
HP Ultrium 3-SCSI M23Z
HP Ultrium 4-SCSI H44Z
HP Ultrium 5-SCSI I30Z
Vital Product Data Page 80h - Unit Serial Number - The serial number returned does not follow the actual serial number convention of an actual HP LTO tape drive; however, it is a unique number consisting of letters and digits that is maintained in persistent system configuration.

Vital Product Data Page 83h - Device Identification Page - is supported. The following device descriptors are returned:

  • Code Set=2, Association=0, Identifier Type=1 (ASCII text comprised of the concatenation of VendorID, ProductID, and Serial Number for logical unit)
  • Code Set=1, Association=0, Identifier Type=0 (Binary data comprised of vendor specific information for logical unit)
  • Code Set=1, Association=1, Identifier Type=2 (Binary data comprised of EUI-64 bit assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=3 (Binary data comprised of NAA assigned identifier for target port)*
  • Code Set=1, Association=1, Identifier Type=4 (Binary data comprised of the relative target port ID)*

* if the device access is by means of a Fibre Channel interface, these descriptors are also returned.
VPD=1, Inquiry Pages Support LTO-1 Support LTO-2 Support LTO-3 Support LTO-4 Support LTO-5
00h - List of Supported Pages Yes Yes Yes Yes Yes
80h - Unit Serial Number Yes Yes Yes Yes Yes
83h - Device Identification Yes Yes Yes Yes Yes
85h - Management Network Address N/A N/A N/A No No
86h - Extended Inquiry N/A N/A Yes Yes Yes
87h - Mode Page Policy N/A N/A N/A Yes Yes
88h - SCSI Ports N/A N/A N/A No No
B0h - Sequential Access Device Capabilities N/A N/A Yes Yes Yes
B1h - Manufacturer assigned Serial Number N/A N/A N/A No No
B2h - Tape Alert Supported Flags N/A N/A N/A No No
C0h - Drive Component Revision Page Firmware Yes Yes Yes Yes Yes
C1h - Drive Component Revision Page Hardware Yes Yes Yes Yes Yes
C2h - Drive Component Revision Page PCA Yes Yes Yes Yes Yes
C3h - Drive Component Revision Page Mechanism Yes Yes Yes Yes Yes
C4h - Drive Component Revision Page Head Assembly Yes Yes Yes Yes Yes
C5h - Drive Component Revision Page ACI Yes Yes Yes Yes Yes
C6h - Drive Component Revision Page IO Firmware N/A Yes Yes N/A N/A
Command Description
Load Unload Implemented per specification.
Locate Implemented per specification.
Log Select Only pages supported in Log Sense will have the capability to be reset.
Log Sense See Log Sense-Log Pages.
Log Page Support LTO-1 Support LTO-2 Support LTO-3 Support LTO-4 Support LTO-5
00h - List of Supported Pages Yes Yes Yes Yes Yes

02h - Write Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

Yes Yes Yes Yes Yes

03h - Read Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

Yes Yes Yes Yes Yes
0Ch - Sequential Access Device No No No No No
0Dh - Temperature N/A N/A No No No
11h - DTD Status N/A N/A N/A N/A No
13h - Requested Recovery N/A N/A N/A N/A No
18h - Protocol Specific N/A N/A No No No

2Eh - Tape Alert

Parameter alerts 1-64 always return 0h (condition has not occurred)

Yes Yes Yes Yes Yes
30h - Tape Usage No No No No No
31h - Tape Capacity Yes Yes Yes Yes Yes
32h - Data Compression Yes Yes Yes Yes Yes
33h - Device Wellness N/A N/A N/A N/A No
34h - Performance No No No No No
3Eh - Device Status N/A N/A No No No
Mode Page Support LTO-1 Support LTO-2 Support LTO-3 Support LTO-4 Support LTO-5

01h - Read-Write Recovery

Field PER may be changed by has no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes

02h - Disconnect/Reconnect

Fields maximum Burst Size and DTDC may be changed by have no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes

0Ah - Control Mode

Field RLEC may be changed but has no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes
0Ah, sub-page 01h - Control Mode Extension sub-page N/A N/A N/A No No
0Fh - Data Compression Yes Yes Yes Yes Yes

10h - Device Configuration

Fields SEW, Write Delay Time, and Select Data Compression Algorithm may be changed but has no effect on the tape drive emulation operation.

Yes Yes Yes Yes Yes

10h, sub-page 01h - Device Configuration Extension sub-page

Fields TARPF, TASER, TARCP, and TAPSLD may be changed but has no effect on the tape drive emulation operation.

 N/A N/A N/A No Yes
11h - Medium Partition Yes Yes Yes Yes Yes
18h - (Protocol Specific) Logical unit Control No No No No No
19h - (Protocol Specific) Port Control No No No No No
1Ah - Power condition N/A N/A N/A No No

1Ch - Information Exception Control

Fields Perf, DExcpt, Test, and MRIE may be changed but has no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes
1Dh - Medium Configuration N/A N/A N/A Yes Yes
3Ch - Time Device N/A N/A No No No
3Dh - Extended reset (vendor specific) N/A N/A N/A No No
3Eh - CD-ROM Emulation/Disaster Recovery No No No No No
Command Description
Mode Sense 6 / 10

Mode pages supported in Mode Select are also supported in Mode Sense (see Mode Select 6/10-Mode Pages).

  • Page Code 00h - No requested page (i.e., no page data returned).
  • Page Code 03Fh - return all pages - Implemented per specification.
Persistent Reserve In
  • Code 00h Read Keys - implemented per specification
  • Code 01h Read Reservation - implemented per specification
  • Code 02h Report Capabilities - Persistent Reservation Types EX_AC (Exclusive Access) and EX_AC_RO (Exclusive Access - Registrants Only) are supported.
  • Code 03h Read Full Status - is not supported.
Persistent Reserve Out
  • Codes 00h-06h - implemented per specification
  • Code 07h - Register and Move - is not supported.
Prevent / Allow Medium Removal Implemented per specification.
Read Implemented per specification.
Read 6 (CD-ROM mode) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Read 10 (CD-ROM mode) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Read Capacity (CD-ROM mode) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Read Position Implemented per specification.
Read Toc (CD-ROM mode) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Read Media Serial Number ABh, (01h) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Read Attribute Implemented per specification.
Read Block limits Maximum Transfer Size is 200000h (i.e., 2 MB).
Read Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Receive Diagnostics
  • PVC=1, Page Code 00h, Supported Page List - indicates that no other Diagnostic Pages are supported.
  • PVC=0, returns a hard coded Diagnostic Report Page of length 6 bytes with values of: 01h, 00h, 01h, 00h, 01h, 00h.
Release Unit 6/10 For Release 10, parameter list value should be < = 255, otherwise returns check condition, parameter not supported (5h, 26h, 1h).
Report Density Support Implemented per specification.
Report Device Identifier A3h, (05h) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Report LUNS Implemented per specification.
Report Supported Opcodes A3h, (0Ch)
  • HP LTO4, HP LTO5 - Implemented per specification.
  • HP LTO1, HP LTO2, HP LTO3 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models HP LTO1, HP LTO2, and HP LTO3 do not support this OpCode in compliance with its reported support of T10 SPC.
Report Supported Task Management Functions A3h, (0Dh)
  • HP LTO4, HP LTO5 - Implemented per specification.
  • HP LTO1, HP LTO2, HP LTO3 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models HP LTO1, HP LTO2, and HP LTO3 do not support this OpCode in compliance with its reported support of T10 SPC.
Report Target Port Groups A3h, (0Ah) Command not supported.
Request Sense Implemented per specification.
Reserve Unit 6/10 For Reserve 10, parameter list value should be < = 255, otherwise returns check condition, parameter not supported (5h, 26h, 1h).
Rewind Implemented per specification.
Security Protocol In (SPIN): A2h

HP LTO1, HP LTO2, HP LTO3, HP LTO4 - Command is not supported. Returns check condition, unsupported command (5h, 20h, 0h).

HP LTO5 - This feature is minimally supported. It indicates that tape data encryption/decryption is disabled. SecurityProtocol[Security Protocol Specific] of 00h[0000h], 00h[0001h], 20h[0000h], 20h[0001h] are supported.
Security Protocol Out Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Seek (CD-ROM) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Send Diagnostics

SelfTst=0

Self-Test Code - 00h is supported.
Self-Test Codes - 01h, 02h, 04h, 05h, 06h return status GOOD if parameter list length is 0.

SelfTst=1

Self-Test Code - 00h is supported.
Self-Test Codes - 01h-07h are not supported and returns check condition (05h, 24h, 00h).
Set Capacity Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Set Device Identifier A4h, (06h) Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Space Implemented per specification.
Start / Stop (CD-ROM mode) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Test Unit Ready Implemented per specification.
Verify Implemented per specification.
Write Implemented per specification.
Write Attribute Implemented per specification.
Write Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Write Filemarks Implemented per specification.

Emulated IBM Tape Drive SCSI Command Deviations

This section documents the emulated IBM tape drive SCSI command deviations. For a complete list of the IBM LTO tape drive SCSI commands, refer to the appropriate IBM drive manual (see www.IBM.com).

The following table provides general information about the emulated IBM LTO SCSI command deviations.

General Information

Tape Cartridge Capacity

The DX Ultrium LTO tape cartridge capacity may not necessarily match an actual Ultrium LTO tape cartridge. The user is given the option when creating cartridges to set the capacity depending on the DX system configuration.

Note: The tape directory for a virtual tape cartridge is limited to a maximum of 32,000 entries. Entries in both Filemarks and Datablocks contribute to this maximum. Writing data with non-fixed block sizes can exhaust the number of available entries.

MAM (Medium Auxiliary Memory) support

Cartridge MAM is supported. All media will indicate Medium Manufacturer Attribute as Quantum (0x400). All media will indicate Medium Serial Number Attribute (0x401) as blank.

Tape Drive Compression

When the tape drive is enabled for compression, depending on the system configuration, the data may not actually be compressed.

FC versus SCSI interface

Wherever there is different responses for SCSI and FC interface, emulation response will be always FC.

WORM Cartridges

WORM (Write Once Read Many) Cartridge Type is not supported in the DXi product. Although, the tape drive emulation will indicate that it has WORM support, no such cartridge types can ever be created in the DXi system.

Encryption/Decryption

The later model LTO drive types have the capability to encrypt data as it is written to tape medium and decrypt it when reading this data back. This feature is not emulated.

Multiple Partitions

Multiple partitions are not supported for any Tape Drive Types.
 

APPEND-ONLY

WriteMode is supported for IBM LTO5.
Allow Overwrite: 82h

IBM LTO5

Implemented per specification.

IBM LTO1, IBM LTO2, IBM LTO3, IBM LTO4

Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models IBM LTO1, IBM LTO2, IBM LTO3, and IBM LTO4 do not support this OpCode in compliance with their reported support of T10 SPC.
Erase

Setting “Long” does not overwrite the entire tape cartridge data area with Data Set Separators.

Note: The data on the emulated tape cartridge is not physically erased. The tape cartridge directory information is reset to indicate an empty tape cartridge.
Format Medium: 04h Command is not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Inquiry

Standard Page

HiSup=1 - this aids in detection of large number of LUNs.
Product Revision. See Inquiry-Standard Page (Vendor ID, Product ID, Product Revision) for product revisions for actual IBM tape drives which enjoy wide popularity.
Vendor ID Product ID Product Revision
IBM ULTRIUM-TD1 5AU1
IBM ULTRIUM-TD2 67U1
IBM ULTRIUM-TD3 73P5
IBM ULTRIUM-TD4 82FB
IBM ULTRIUM-TD5 A5M0
Vital Product Data Page 80h - Unit Serial Number - nit Serial Number - The serial number returned does not follow the actual serial number convention of an actual IBM LTO tape drive; however, it is a unique number consisting of letters and digits that is maintained in persistent system configuration.

Vital Product Data Page 83h - Device Identification Page - is supported. The following device descriptors are returned:

  • Code Set=2, Association=0, Identifier Type=1(ASCII text comprised of the concatenation of VendorID, ProductID, and Serial Number for logical unit)
  • Code Set=1, Association=0, Identifier Type=0 (Binary data comprised of vendor specific information for the logical unit)
  • Code Set=1, Association=1, Identifier Type=2 (Binary data comprised of EUI-64 bit assigned identifier for logical unit) *
  • Code Set=1, Association=1, Identifier Type=3 (Binary data comprised of NAA assigned identifier for logical unit) *
  • Code Set=1, Association=1, Identifier Type=4 (Binary data comprised of the relative target port ID) *

* If the device access is by means of a Fibre Channel interface, these descriptors are also returned.
VPD=1, Inquiry Pages Support LTO-1 Support LTO-2 Support LTO-3 Support LTO-4 Support LTO-5
00h - List of Supported Pages Yes Yes Yes Yes Yes
03h - Firmware Designation Yes Yes Yes No No
80h - Unit Serial Number Yes Yes Yes Yes Yes
83h - Device Identification Yes Yes Yes Yes Yes
87h - Mode Page Policy N/A N/A N/A Yes Yes
88h - SCSI Ports No No No No No
B0h - Sequential Access Device Capabilities No No No Yes Yes
C0h - Drive Component Revision Page Firmware Yes Yes Yes Yes Yes
C1h - Drive Component Revision Page Hardware N/A N/A N/A Yes Yes
C7h - Device Unique Configuration ACI N/A N/A N/A No No
C8h - Mode Parameter Default Settings IO Firmware N/A N/A N/A No No
D0h/E0h - Vendor Unique IID No No No No No
D1h/E1h - Vendor Unique IID No No No No No
Command Description
Load Unload Implemented per specification.
Locate Implemented per specification.
Log Select Only pages supported in Log Sense will have the capability to be reset.
Log Sense See Log Sense-Log Pages.
Log Page Support LTO-1 Support LTO-2 Support LTO-3 Support LTO-4 Support LTO-5
00h - List of Supported Pages          

02h - Write Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

          

03h - Read Error Counter

Only parameter codes 0h-6h are supported. Parameter codes related to error counts or retries will always report as 0h.

          
06h - Non-Medium Errors          
0Ch - Sequential Access Device          
0Dh - Temperature          
11h - DTD Status          
14h - Device Statistics Log          
16h - Tape Diagnostic Data Log          
17h - Volume Statistics          
18h - Protocol Specific          
1Ah - Power Condition Transitions          
1Bh - Data Compression          

2Eh - Tape Alert

Parameter alerts 1-64 always return 0h (condition has not occurred)

          
30h - Tape Usage          
31h - Tape Capacity          
32h - Data Compression          
33h - Write Errors          
34h - Read Forward Errors          
37h - Read Performance Characteristics          
38h - Bytes/Block Transferred          
39h - Host Port 0 Interface Errors     No No No
3Ah - Drive Control Verification   No No No No
3Bh - Host Port 1 Interface Errors N/A No No No No
3Ch - Drive Usage Information N/A N/A No No No
3Dh - Subsystem Statistics No No No No No
3Eh - Device Status N/A N/A No No No
Mode Page Support LTO-1 Support LTO-2 Support LTO-3 Support LTO-4 Support LTO-5

01h - Read-Write Recovery

Field PER may be changed by has no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes

02h - Disconnect/Reconnect

Fields maximum Burst Size and DTDC may be changed by have no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes

0Ah - Control Mode

Field RLEC may be changed but has no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes
0Ah, sub-page 01h - Control Mode Extension sub-page N/A N/A N/A No No
0Fh - Data Compression Yes Yes Yes Yes Yes

10h - Device Configuration

Fields SEW, Write Delay Time, and Select Data Compression Algorithm may be changed but has no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes

10h, sub-page 01h - Device Configuration Extension sub-page

WriteMode setting of 0 (WRITE-ANYWHERE) and 1 (APPEND-ONLY) are supported.

 N/A N/A N/A N/A Yes
11h - Medium Partition N/A N/A N/A N/A No
18h - (Protocol Specific) Logical unit Control No No No No No
19h - (Protocol Specific) Port Control No No No No No

1Ch - Information Exception Control

Fields Perf, DExcpt and Test may be changed but have no effect on the tape drive emulation operation.

 Yes Yes Yes Yes Yes
1Dh - Medium Configuration N/A N/A N/A Yes Yes
24h - Vendor Specific Control No No No No No
2Fh - Behavior Configuration No No No No No
3Dh - LEOT No N/A N/A N/A N/A
Command Description
Mode Sense 6 / 10

Mode pages supported in Mode Select are also supported in Mode Sense (see Mode Select 6/10-Mode Pages).

  • Page Code 00h - No requested page (i.e., no page data returned).
  • Page Code 03Fh - return all pages - Implemented per specification.
Persistent Reserve In
  • Code 00h Read Keys - implemented per specification
  • Code 01h Read Reservation - implemented per specification
  • Code 02h Report Capabilities - Persistent Reservation Types EX_AC (Exclusive Access) and EX_AC_RO (Exclusive Access - Registrants Only) are supported.
  • Code 03h Read Full Status - is not supported.
Persistent Reserve Out
  • Codes 00h-06h - implemented per specification
  • Code 07h - Register and Move - is not supported.
Prevent / Allow Medium Removal Implemented per specification.
Read Implemented per specification.
Read Attribute Implemented per specification.
Read Block limits Maximum Transfer Size is 200000h (i.e., 2 MB).
Read Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Read Position Implemented per specification.
Receive Diagnostics
  • PVC=1, Page Code 00h, Supported Page List - indicates that no other Diagnostic Pages are supported.
  • PVC=0, returns a hard coded Diagnostic Report Page of length 6 bytes with values of: 01h, 00h, 01h, 00h, 01h, 00h.
Release Unit 6/10 Implemented per specification.
Report Density Support Implemented per specification.
Report LUNS Implemented per specification.
Report Supported Opcodes A3h, (0Ch)
  • IBM LTO5 - Implemented per specification.
  • IBM LTO1, IBM LTO2, IBM LTO3, IBM LTO4 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models IBM LTO1, IBM LTO2, IBM LTO3, and IBM LTO4 do not support this OpCode in compliance with its reported support of T10 SPC.
Report Supported Task Management Functions A3h, (0Dh)
  • IBM LTO5 - Implemented per specification.
  • IBM LTO1, IBM LTO2, IBM LTO3, IBM LTO4 - Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Note: The tape drive models IBM LTO1, IBM LTO2, IBM LTO3, and IBM LTO4 do not support this OpCode in compliance with its reported support of T10 SPC.
Report Timestamp A3h, (0Fh) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Request Sense Sense Data - fields Error Flag Data, Current Wrap, and SCSI Address are not supported an return 0.
Reserve Unit 6/10 Implemented per specification.
Rewind Implemented per specification.
Security Protocol In (SPIN)

IBM LTO1, IBM LTO2, IBM LTO3, IBM LTO4 - Command is not supported. Returns check condition, unsupported command (5h, 20h, 0h).

IBM LTO5 - This feature is minimally supported. It indicates that tape data encryption/decryption is disabled. SecurityProtocol[Security Protocol Specific] of 00h[0000h], 00h[0001h], 20h[0000h], 20h[0001h] are supported.
Security Protocol Out Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Send Diagnostics

SelfTst=0

Self-Test Code - 00h is supported.
Self-Test Codes - 01h, 02h, 04h, 05h, 06h return status GOOD if parameter list length is 0.

SelfTst=1

Self-Test Code - 00h is supported.
Self-Test Codes - 01h-07h are not supported and return check condition (05h, 24h, 00h).
Set Capacity Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Set Timestamp A4h, (0Fh) Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).
Space Implemented per specification.
Test Unit Ready Implemented per specification.
Verify Implemented per specification.
Write Implemented per specification.
Write Attribute Implemented per specification.
Write Buffer Command is not supported. This command will return Unsupported Command Check Condition (5h, 20h, 0h).
Write Filemarks Implemented per specification.

Emulated Quantum Disk Drive SCSI Command Deviations

This section describes the Virtual Disk Driver SCSI command support.

Command Description
Start Stop Unit This command is accepted, but has no effect, always returns status GOOD.
Test Unit Ready This command is accepted, but has no effect, always returns status GOOD.
Synchronize Cache This command is accepted, but has no effect, always returns status GOOD.
Verify This command is accepted, but has no effect, always returns status GOOD.
Verify 16 This command is accepted, but has no effect, always returns status GOOD.
Reserve 6 This command is accepted, but has no effect, always returns status GOOD.
Release 6 This command is accepted, but has no effect, always returns status GOOD.
Reserve 10 This command is accepted, but has no effect, always returns status GOOD.
Release 10 This command is accepted, but has no effect, always returns status GOOD.
Read 6 As per SBC-2. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Read 10 As per SBC-2. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Read 16 As per SBC-2. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Write 6 As per SBC-2. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Write 10 As per SBC-2. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Write 16 As per SBC-2. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Write Verify 10 Behaves as a WRITE 10, no actual data verification is done. Can return CHECK CONDITION with MEDIUM ERROR, or ILLEGAL REQUEST.
Inquiry A subset of behaviors mentioned in SPC-2 is supported.
Report LUNS A subset of behaviors mentioned in SPC-2 is supported.
Read Capacity 10 A subset of behaviors mentioned in SPC-2 is supported.
Mode Sense 6 As per SPC-2: See Mode Sense Pages.
Request Sense As per SPC-2, always return NO SENSE.
Service Action In 16

Returns in a buffer the highest block number (LBA) and the size in bytes of a block. See Byte Number-Contents.
Mode Pages Description
0x00 Return short LBA with number of blocks and block length.
0x02 Disconnect-Reconnect mode page
0x03 Obsolete (Format Device mode page)
0x04 Obsolete (Rigid Disk Geometry mode page)
0x08 Caching mode page
0x0a Control mode page
0x1c Informational Exceptions Control mode page
0x3f Send all the above mode pages
Byte Number Contents
0-7 Highest block number
8-12 Size of a block in bytes

Command Control LUN (CCL)

This section documents where the DXi-Series system deviates from a SCSI Array Controller Device (e.g., RAID) as defined in the T10 SAM/SCC specifications. This is a type 12 (i.e., 0Ch) SCSI device. There is no actual device that this emulation was based upon.

This device is also commonly referred to by Quantum as a Command Control LUN or CCL.

The main purpose for including this DXi emulation is to handle a special circumstance. It has been noted that some older operating systems require the Array Controller Device (e.g., RAID) to be mapped at LUN 0 in order to detect large number of LUNs beneath it on this port. While it is typical that these LUNs are usually SCSI disk devices, it has been observed that other SCSI devices will also be detected. In the case of DXi, these SCSI devices are VTLs, which can now be configured with large number of SCSI tape devices. Without this requirement, the operating system will not automatically scan for large number of LUNs (usually > 8 LUNs). This emulation should only be configured for this special circumstance. With this main purpose in mind, the rationale is to emulate only the minimal SCSI command set to satisfy this special requirement. Most importantly, it needs to properly handle the Report LUNs, Inquiry, Request Sense, and Test Unit Ready commands in order to properly support device detection.

The following section provides general information about the emulated CCL command deviations from the SAM/SCC specifications.

Command/Page

Description

Inquiry

The inquiry page is as follows:

Standard Page

  • Vendor Identification - QUANTUM
  • Product Identification - DXi CCL

 

Vital Product Data Page 80h - Unit Serial Number

The serial number returned may not follow any actual serial number convention of an actual Array Controller Device. However, it is a unique number consisting of letters and digits that is maintained by persistent system configuration.

 

Vital Product Data Page 83h

Device Identification Page - is supported.

The following device descriptors are returned:

  • Code Set=1, Association=0, Identifier Type=3 (Binary data comprised of NAA assigned identifier for logical unit) *
  • Code Set=1, Association=1, Identifier Type=3 (Binary data comprised of NAA assigned identifier for target port) *
  • Code Set=1, Association=1, Identifier Type=4 (Binary data comprised of the relative target port ID) *

* If the device access is by means of a Fibre Channel interface, these descriptors are also returned.

Maintenance In

Not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Persistent Reserve In
  • Code 00h Read Keys - implemented per specification.
  • Code 01h Read Reservation - implemented per specification.
  • Code 02h Report Capabilities - Persistent Reservation Types EX_AC (Exclusive Access) and EX_AC_RO (Exclusive Access - Registrants Only) are supported.
  • Code 03h Read Full Status - is not supported.

Persistent Reserve Out
  • Codes 00h-06h - implemented per specification.
  • Code 07h - Register and Move - is not supported.

Redundancy Group In

Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Request Sense

Implemented as per SAM specifications.

Release Unit 6/10

3rd party reservation is not supported

Report LUNS

Implemented as per SAM specification

Reserve Unit 6/10

3rd party reservation is not supported.

Test Unit Ready

Implemented as per SAM specification.

Volume Set In

Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).

Volume Set Out

Command not supported. Returns check condition, unsupported command (5h, 20h, 0h).