Inquiry - 12h

The INQUIRY CDB format is shown in the following table.

Table 1: INQUIRY CDB format

Bit Byte	7	6	5	4	3	2	1	0
0	Op Code (12h)
1	Logical Unit Number			Reserved			CMDDT	EVPD
2	Page Code
2	Page Code
3	Reserved
4	Allocation Length
5	Control

Field	Description
Command Support Data (CMDDT)	This field is not supported and must be set to 0.
Enable Vital Product Data (EVPD)	An EVPD value of 1 indicates that the vital product data specified by the Page Code should be returned. A value of 0 indicates that standard inquiry data should be returned.
Page Code	This field specifies which vital product data page to return if the EVPD bit is set to 1. If the EVPD bit is set to 0, the Page Code must be 00h. The library supports the following page codes: 00h - Supported Vital Product Data pages (this list) 80h - Unit Serial Number page 83h – Device Identification page 85h - Management Network Addresses page C8h - Vendor Specific Device Capabilities page C0h – Firmware Revision page D0h – Vendor Specific page E0h – Implemented SCSI Command page E1h – Implemented Vendor Specific page FFh – Failover Key page
Allocation Length	The Allocation Length field specifies the maximum number of bytes that the initiator allocated for returned inquiry data. An Allocation Length of 0 indicates that no inquiry data is to be transferred (this condition is not considered an error). The library terminates the data transfer when it has transferred the lesser of either the number of bytes specified by the Allocation Length field or all of the available inquiry data.

Standard Inquiry Response

Table 2: Standard Inquiry Response

Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	RMB	Reserved
2	Version
3	AERC	Obsolete	NormACA	HiSup	Response Data Format
4	Additional Length
5	SCCS	Rsvd	TPGS		3PC	Reserved		PROTECT
6	BQue	EncServ	BarC	MultiP	MChngr	Obsolete	Obsolete	Addr16
7	RelAdr	Obsolete	Wbus16	Sync	Linked	Obsolete	CmdQue	SftRe
8 : 15	Vendor Identification
8 : 15	Vendor Identification
16 : 31	Product Identification
16 : 31	Product Identification
32 : 35	Firmware Revision Level
32 : 35	Firmware Revision Level
36 : 54	Full Firmware Revision Level
36 : 54	Full Firmware Revision Level
55	Reserved							BarC
56*	Reserved				Clocking		QAS	IUS
57*	Reserved
58*	Optional Version Descriptor 1
59*	Optional Version Descriptor 1
:
n-1*	Optional Version Descriptor n
n*	Optional Version Descriptor n
* When requesting a standard inquiry response from a media changer device logical unit hosted by a DA blade, only data for bytes 0 to 55 will be returned. Bytes 56 and all following bytes are not returned by media changer device logical units hosted by a DA blade.

Note: For Scalar i2000 and i6000 libraries - Once a library control firmware update gets scheduled, the library will not show the firmware revision of the installed library firmware bundle in the standard inquiry response if the library is operating in an emulation mode, but rather emulates a firmware version for the emulated device.

Standard Inquiry Response

**Table 1:**
Standard Inquiry Response
Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	RMB	Reserved
2	Version
3	AERC	Obsolete	NormACA	HiSup	Response Data Format
4	Additional Length
5	SCCS	Rsvd	TPGS		3PC	Reserved		PROTECT
6	BQue	EncServ	BarC	MultiP	MChngr	Obsolete	Obsolete	Addr16
7	RelAdr	Obsolete	Wbus16	Sync	Linked	Obsolete	CmdQue	SftRe
8 : 15	Vendor Identification
8 : 15	Vendor Identification
16 : 31	Product Identification
16 : 31	Product Identification
32 : 35	Firmware Revision Level
32 : 35	Firmware Revision Level
36	Plant of Manufacture Code
37	Plant of Manufacture Code
38 : 49	Serial Number
38 : 49	Serial Number
50	‘0’ (in ASCII)
51	‘0’ (in ASCII)
55	Reserved							BarC
56	Reserved				Clocking		QAS	IUS
57	Reserved

Field	Description
Peripheral Qualifier	A return value of 000b indicates that the library supports the peripheral device type at the specified LUN. A return value of 001b indicates that the library is capable of supporting the peripheral device type at the specified LUN, however the device is not currently connected to it. A return value of 011b indicates no peripheral device types are supported at that LUN.
Peripheral Device Type	For media changer device logical units, this field returns 01000b (08h) to indicate it is a media changer device. For the DA blade controller device logical unit, this field returns 01100b (0Ch) to indicate it is a controller device. If an unsupported LUN was specified, this field returns 11111b (1Fh), which indicates that the device type is unknown.
Removable Medium Bit (RMB)	For media changer device logical units, this field returns 1, indicating media is removable. For the DA blade controller device logical unit it returns 0.
Version	This field returns 03h, indicating compliance with the SCSI-3 standard. Note that this field will report SCSI-3 standard compliance despite support of various SMC-x defined command and response information for certain SCSI commands.
Asynchronous Event Reporting Capability (AERC)	Returned as 0, indicating AERC is not supported.
Normal ACA Supported (NormACA)	If the media changer device is configured through a control path drive, the NACA bit is not supported and this field returns 0.
Hierarchical Support (HiSup)	This field returns a 1, indicating that the hierarchical addressing model is used to assign LUNs, and that the REPORT LUNs command is supported.
Response Data Format	Returned as 0010b, indicating response data is in standard SCSI format.
Additional Length	When requesting a standard inquiry response from the DA blade controller device logical unit, this field is set to 1Fh, indicating 31 additional bytes of data following this field. When requesting a standard inquiry response from a media changer device logical unit hosted by a DA blade, this field returns 33h, indicating 51 additional bytes of data following this field. When requesting a standard inquiry response from a media changer device logical unit hosted by a tape drive, this field is set by the media changer device to 33h, indicating that 51 additional bytes of data will be following this field. However, the tape drive hosting the media changer device control path may modify data within the response and update the length value, depending on the tape drive interface type and supported version descriptors.
SCC Supported (SCCS)	For the media changer device logical units, this field returns a 0. For the DA blade controller device logical unit, this field returns a 1.
Target Port Groups Supported (TPGS)	If the media changer device control path is hosted by a DA blade, this field is set to 0. If the media changer device control path is hosted by a tape drive, this field is filled in by the tape drive hosting the interface and may be set to 1 if the REPORT TARGET PORT GROUPS command is supported.
Third Party Copy (3PC)	This field is set to 0 to indicate that third party copy is not supported.
PROTECT	This field is set to 0 to indicate that protection information is not supported.
Basic Queuing (BQue)	Returned as 0, indicating basic queuing is not supported.
Enclosure Services (EncServ)	Returned as 0, indicating an enclosure services component is not included.
Bar Code (BarC)	For media changer device logical units, this field returns a 1, indicating a bar code scanner or imaging device is installed (also returned in byte 55 below). For the controller device logical unit, this field returns a 0.
Multi Port (MultiP)	Returned as 0 if the device providing the medium changer interface supports a single port; returned as 1 if the device providing the medium changer interface supports 2 or more ports.
Media Changer (MChngr)	This field returns a 0, indicating it is not an attached media changer device.
Wide SCSI Address 16 (Addr16)	Returned as 1, indicating 16-bit wide SCSI addresses are supported (applies to parallel SCSI only).
Relative Address (RelAdr)	Returned as 0, indicating relative addressing is not supported.
Wide Bus 16 (Wbus16)	Returned as 1, indicating 16 bit transfers are supported (applies to parallel SCSI only).
Synchronous Transfer (Sync)	Returned as 1, indicating synchronous transfers are supported (applies to parallel SCSI only).
Linked Commands (Linked)	Returned as 0, indicating linked commands are not supported.
Command Queuing (CmdQue)	For Fibre Channel, this is returned as 1, indicating command queuing is supported. For SCSI and SAS, this is returned as 0, indicating no command queuing is supported.
Soft Reset (SftRe)	Returned as 0, indicating a soft reset is not supported.
Vendor Identification	Returned as one of the following (space filled to 8 bytes): "QUANTUM " "ADIC "
Vendor Identification	Returned as the following (space filled to 8 bytes): "ADIC " for Quantum Scalar product identifications and Dell PowerVault ML6000 product identifications
Vendor Identification	Returned as one of the following (space filled to 8 bytes): "IBM " for IBM product identifications "ADIC " for Quantum product identifications
Product Identification	Depending upon the library type, returned as one of the following (space filled to 16 bytes): Returned as the following (space filled to 16 bytes): Returned as one of the following (space filled to 16 bytes): "Scalar 24 " "Scalar 100 " "Scalar 1000 " "Scalar 10K " "Pathlight VX " "Scalar i500 " "Scalar i40-i80 " "Scalar i6000 " "Scalar i3-i6 " "Scalar i500 " for Dell PowerVault ML6000 product identification "3576-MTL " "Scalar i500 "
Firmware Revision Level	Returned as the ASCII representation of the revision level, such as “100A” or “203G”. The remaining fields are only returned for media changer device logical units.
Full Firmware Revision Level	Same as the firmware revision level, but extended to include the build number (if available).
Bar Code (BarC)	Returned as 1, indicating a bar code scanner or imaging device is installed. Also returned in byte 6 above.
Clocking	This field is only returned for media changer device logical units controlled via parallel SCSI; otherwise, this field is reserved. This field does not apply to asynchronous transfers and is defined as: 00b – Indicates the target port supports only single transition (one transfer per clock cycle). 01b – Indicates the target port supports only double transition (two transfers per clock cycle; 16-bit only). 10b – Reserved. 11b – Indicates the target port supports single transition and double transition.
QAS	This field is only returned for media changer device logical units controlled via parallel SCSI; otherwise, this field is reserved. A quick arbitration and selection supported (QAS) bit of one indicates that the target port supports quick arbitration and selection. A value of zero indicates that the target port does not support quick arbitration and selection.
IUS	This field is only returned for media changer device logical units controlled via parallel SCSI; otherwise, this field is reserved. An information units supported (IUS) bit of one indicates that the SCSI target device supports information unit transfers. A value of zero indicates that the SCSI target device does not support information unit transfers.
Version Descriptors	Indicate SCSI command compliance with certain standards. The data transfer element hosting the interface will add/insert version descriptors reporting which physical layer and transport layer revisions are claimed. One or more of the following version descriptors may be reported: 005Ch – 2 ANSI INCITS 366-2003. 008Dh – SAM-4. 0120h – SPC compliance. 02FEh – SMC-2 ANSI INCITS 382-2004 compliance. 0917h – FCP-2 ANSI INCITS 350-2003 or FCP-3. 0A11h – FCP-3 ANSI INCITS 416-2006. 0D7Dh – FC-AL-2 ANSI INCITS 332-1999 with Amnd 1 AM1-2003. 0DBCh – FC-FS ANSI INCITS 373-2003. 131Ch – FC-Tape ANSI INCITS TR-24 1999. 133Ch – FC-FLA ANSI INCITS TR-20 1998.

Plant of Manufacture Code

The value returned for this field is the code for the manufacturing plant.

Serial Number

The value returned for this field is the serial number for the system, right-justified with leading zeroes.

Vital Product Data Pages

The collection of Vital Product Data pages is as follows:

Supported Vital Product Data Page (00h)

Contains a list of all supported vital product data page codes.

Table 3: Supported Vital Product Data Page (00h)

Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (00h)
2	Reserved
3	Page Length
4	First Page Code Supported
5	Second Page Code Supported
6	Third Page Code Supported
7	Fourth Page Code Supported
8	Fifth Page Code Supported
7	Fourth Page Code Supported
8	Fifth Page Code Supported
9	Sixth Page Code Supported
10	Seventh Page Code Supported
11	Eighth Page Code Supported

Field	Description
Peripheral Qualifier	The return value 000b indicates that the library supports the peripheral device type at the specified LUN. This field returns 011b if no peripheral device types are supported at that LUN.
Peripheral Device Type	For media changer device logical units, this field returns 01000b (08h) to indicate it is a media changer device. For the controller device logical unit, this field returns 01100b (0Ch) to indicate it is a controller device. If an unsupported LUN was specified, this field returns 11111b (1Fh), which indicates that the device type is unknown.
Page Code	Returned as 00h, indicating this page.
Page Length	Returns the number of bytes following this field.
First Page Code Supported	Returned as 00h, indicating support for the Supported Vital Product Data Page.
Second Page Code Supported	Returned as 80h, indicating support for the Unit Serial Number Page.
Third Page Code Supported	Returned as 83h, indicating support for the Device Identification Page.
Fourth Page Code Supported	Returned as 85h, indicating support for the Management Network Addresses Page.
Fifth Page Code Supported	Returned as C8h, indicating support for Vendor Specific Device Capabilities Page.

Fourth Page Code Supported

Returned as C0h, indicating support for the Firmware Revision Page.

Fifth Page Code Supported

Returned as D0h, indicating support for a Vendor Specific Page.

Sixth Page Code Supported

Returned as E0h, indicating support for the Implemented SCSI Command Page.

Seventh Page Code Supported

Returned as E1h, indicating support for the Implemented Vendor Specific Command Page.

Eighth Page Code Supported

Returned as FFh, indicating support for the Failover Key Page.

Unit Serial Number Page (80h)

Second page code supported. Returns system serial number.

Table 4: Unit Serial Number Page (80h)

Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (80h)
2	Reserved
3	Page Length
4 : 27	Serial Number
4 : 27	Serial Number

Unit Serial Number Page (80h)

**Table 2:**
Unit Serial Number Page (80h)
Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (80h)
2	Reserved
3	Page Length
4 : 19	Serial Number
4 : 19	Serial Number

Field	Description
Peripheral Qualifier	The return value 000b indicates that the library supports the peripheral device type at the specified LUN. This field returns 011b if no peripheral device types are supported at that LUN.
Peripheral Device Type	For media changer logical units, this field returns 01000b (08h) to indicate it is a media changer device. For the controller device logical unit, this field returns 01100b (0Ch) to indicate it is a controller device. If an unsupported LUN was specified, this field returns 11111b (1Fh), which indicates that the device type is unknown.
Peripheral Device Type	This field returns 01000b (08h) to indicate it is a media changer device. If an unsupported LUN was specified, this field returns 11111b (1Fh), which indicates that the device type is unknown.
Page Code	Returned as 80h, indicating this page.
Page Length	Returned as 18h, indicating the remaining number of bytes following this field.
Page Length	Returned as 10h, indicating the remaining number of bytes following this field.
Serial Number	The value returned for this field is the serial number for the system, prefixed with the vendor identification. The serial number is padded with trailing spaces as needed to complete the 24 bytes.
Serial Number	– The value returned for this field is the serial number for the system, right-justified with leading zeroes, and suffixed with the logical library identifier. For example: DELLQUANTUM123456789 or DELLQUANTUM123456789_LL1 If the serial number cannot be obtained, the serial number portion is replaced with zeros followed by trailing spaces. For example: DELLQUANTUM000000000

Device Identification Page (83h)

Third page code supported. Returns device identification descriptors.

Table 5: Device Identification Page (83h)

Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (83h)
2	Reserved
3	Page Length (n-3)
Identification Descriptors (see Table 6)
4 :	First Identification Descriptor
4 :	First Identification Descriptor
:
: n	Last Identification Descriptor
: n	Last Identification Descriptor

Field	Description
Peripheral Qualifier	The return value 000b indicates that the library supports the peripheral device type at the specified LUN. This field returns 011b if no peripheral device types are supported at that LUN.
Peripheral Device Type	For media changer device logical units, this field returns 01000b (08h) to indicate it is a media changer device. For the controller device logical unit, this field returns 01100b (0Ch) to indicate it is a controller device. If an unsupported LUN was specified, this field returns 11111b (1Fh), which indicates that the device type is unknown.
Page Code	Returned as 83h, indicating this page.
Page Length	Returns the remaining number of bytes following this field.

Identification Descriptors

The general format of identification descriptors are in the table below.

Table 6: Identification Descriptors

Bit Byte	7	6	5	4	3	2	1	0
0	Protocol Identifier				Code Set
1	PIV	Rsvd	Association		Identifier Type
2	Reserved
3	Identifier Length (n-3)
4 : n	Identifier
4 : n	Identifier

Field	Description
Protocol Identifier	The PROTOCOL IDENTIFIER field may indicate the SCSI transport protocol to which the identifier type applies. If the ASSOCIATION field contains a value other than 01b (i.e., target port) or 10b (i.e., SCSI target device) or the PIV bit is set to zero, then the PROTOCOL IDENTIFIER field contents are reserved. If the ASSOCIATION field contains a value of 01b or 10b and the PIV bit is set to one, then the PROTOCOL IDENTIFIER field shall contain one of the values shown below to indicate the SCSI transport protocol to which the identifier type applies. 0h – Fibre Channel 1h – Parallel SCSI 2h – SSA 3h – IEEE 1394 4h – SCSI Remote Direct Memory Access Protocol 5h – Internet SCSI (iSCSI) 6h – SAS Protocol Layer 7h – Automation/Drive Interface Transport Protocol 8h – AT Attachment Interface (ATA/ATAPI) 9h to Eh – Reserved Fh – No specific protocol
Code Set	This field returns the following values: 1h – the Identifier field contains binary values 2h – the Identifier field contains ASCII characters
PIV	A protocol identifier valid (PIV) bit set to zero indicates the PROTOCOL IDENTIFIER field contents are reserved. If the ASSOCIATION field contains a value of 01b or 10b then a PIV bit set to one indicates the PROTOCOL IDENTIFIER field contains a valid protocol identifier. If the ASSOCIATION field contains a value other than 01b or 10b, then the PIV bit contents are reserved.
Association	This field returns the following values: 0h – the Identifier field is associated with the address physical or logical device 1h – the Identifier field is associated with the port that received the request
Identifier Type	This field returns the following values: 1h – The identifier is a concatenation of the Vendor Identification field from the Standard Inquiry response and the Serial Number field (without the Vendor Identification prefix) from the Unit Serial Number page. 3h – The identifier is an IEEE Registered format Name_Identifier (Worldwide Name). 4h – The identifier is a port number. In this case, the Code Set and Association fields will both be set to 1.
Identifier Length	This is the length of the Identifier field, and will vary by identifier type.
Identifier	This is the identifier as described by the Code Set, Association, and Identifier Type fields.

Identification Descriptors

The media changer device logical unit returns the T10 Device Identification Descriptor (type 1h) as well as the NAA Device Identification Descriptor (type 3h). The data transfer element hosting the interface will add a NAA Port Identification Descriptor (type 3h), and a Relative Target Port Identifier (type 4h) and may modify which descriptor is reported depending on the medium changer reporting as its own device at LUN 0, or just a LUN behind the data transfer element device.

Media Changer Identification Descriptor

Media changer logical units report only a single identifier. They will report the same identifier on either SCSI or Fibre Channel.

Table 7: Media Changer Identification Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	Protocol Identifier				Code Set = 2h
1	PIV	Rsvd	Association = 0h		Identifier Type= 1h
2	Reserved
3	Identifier Length = 20h (32)
4 11	Vendor Identification (as reported in the Standard Inquiry response)
4 11
12 35	Serial Number (as reported in the Unit Serial Number page without Vendor Identification prefix)
12 35

Media Changer Device Identification Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	Reserved				Code Set = 2h
1	Reserved		Association = 0h		Identifier Type= 1h
2	Reserved
3	Identifier Length = 28h (40)
4 : 11	Vendor Identification (as reported in the Standard Inquiry response)
4 : 11
12 : 27	Product Identification (as reported in the Standard Inquiry response)
12 : 27
28 : 43	Serial Number (as reported in the Unit Serial Number page)
28 : 43	Serial Number (as reported in the Unit Serial Number page)

Controller Device Identification Descriptors

On the parallel SCSI and SAS interface, the controller device logical unit will return the same identification descriptor as the media changer devices, as shown in Table 7.

On the Fibre Channel interface, the controller device logical unit will return three different identification descriptors as shown Table 8, Table 9, and Table 11.

The first two descriptors describe the World Wide Node Name and World Wide Port Name.

Table 8: Controller Device Node Identification Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	Protocol Identifier				Code Set = 1h
1	PIV	Rsvd	Association = 0h		Identifier Type= 3h
2	Reserved
3	Identifier Length = 08h
4 : 11	World Wide Node Name (WWNN)
4 : 11	World Wide Node Name (WWNN)

Table 9: Controller Device Port Identification Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	Protocol Identifier				Code Set = 1h
1	PIV	Rsvd	Association = 1h		Identifier Type= 3h
2	Reserved
3	Identifier Length = 08h
4 : 11	World Wide Port Name (WWPN)
4 : 11	World Wide Port Name (WWPN)

The eight-byte Node and Port Worldwide Names have the following format:

Table 10: Node and Port Worldwide Names

MSB

LSB

4-bit NAA ID

24-bit Company ID

36-bit Vendor Specified Identifier

00 30 8C - Quantum Corporation

(Default Vendor ID, formerly ADIC)

00 50 84 - Quantum Corporation (reassigned by IEEE as of 09/03/2019)

00 0E A4 - Quantum Corporation (reassigned by IEEE as of 09/03/2019)

Assigned per library

The third descriptor (see table below) describes the relative target port.

Table 11: Relative Target Port Identification Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	Protocol Identifier				Code Set = 1h
1	PIV	Rsvd	Association = 1h		Identifier Type= 4h
2	Reserved
3	Identifier Length = 04h
4 : 7	Port Number (Starting with 1)
4 : 7	Port Number (Starting with 1)

Firmware Revision Page (C0h)

**Table 3:**
Firmware Revision Page (C0h)
Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (C0h)
2	Reserved
3	Page Length
4 : 25	Revision
4 : 25	Revision

Peripheral Qualifier – The return value 000b indicates that the library supports the peripheral device type at the specified LUN. This field returns 011b if no peripheral device types are supported at that LUN.

Peripheral Device Type – This field returns 01000b (08h) to indicate it is a media changer device. If an unsupported LUN was specified, this field returns 11111b (1Fh), which indicates that the device type is unknown.

Page Code – Returned as C0h, indicating this page.

Page Length – Returns 16h, indicating the remaining number of bytes following this field.

Revision – Returned as the ASCII representation (22 bytes) of the firmware revision level in the form Firmware Revision=x.xx, where x.xx is the firmware level.

Vendor Specific Page (D0h)

The contents of this page are not specified in this document.

Implemented SCSI Command Page (E0h)

**Table 4:**
Implemented SCSI Command Page (E0h)
Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (E0h)
2	Reserved
3	Page Length
4	TEST UNIT READY
5	REQUEST SENSE
6	INITIALIZE ELEMENT STATUS
7	INQUIRY
8	MODE SELECT (6)
9	RESERVE ELEMENT (6)
10	RELEASE ELEMENT (6)
11	MODE SENSE (6)
12	SEND DIAGNOSTIC
13	PREVENT ALLOW MEDIUM REMOVAL
14	POSITION TO ELEMENT
15	WRITE BUFFER
16	READ BUFFER
17	LOG SENSE
18	PERSISTENT RESERVE IN
19	PERSISTENT RESERVE OUT
20	MOVE MEDIUM
21	READ ELEMENT STATUS

Page Code – Returned as E0h, indicating this page.

Page Length – Returns 18, indicating the remaining number of bytes following this field.

Implemented SCSI Commands – The remaining bytes list the implemented SCSI commands for the library. For the command code associated with each command, refer to SCSI Command Support.

Management Network Addresses Page (85h)

Fourth page code supported. Returns system network configurations.

Table 12: Network Address Page

Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier					Peripheral Device Type
1	Page Code (85h)
2 3	(MSB)
2 3	Page Length (n-3)							(LSB)

4	(MSB)	Network services descriptor (first)						(LSB)

n	(MSB)	Network services descriptor (last)						(LSB)

Each network service descriptor contains information about one management service.

Table 13: Network Services Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	Rsvd	Association		Service Type
1	Reserved
2 3	(MSB)
2 3	Network Address Length (n-3)							(LSB)
4 . . N	Network Address

Field	Description
Association	The association shall always be set to 00h "The Identifier field is associated with the addressed logical unit."
Service Type	The service type defines the library access and protocol methodologies. Scalar libraries only support service type 03h to indicate remote UI, CLI, or Web Services support.
Network Address Length	The network address length field contains the length in bytes of the network address field. This length reported in this field is a multiple of 4 bytes.
Network Address	The network address is a null-terminated, null-padded URL. The table above lists the defined network addresses which may be returned. Other vendor unique network addresses may also be returned, although only service type 03h is supported at this time. The network address conforms to RFC 2396 and is of the form "scheme://host:port/path". The host field contains the numeric IP address of the referenced host. The service type and scheme identifies the unique service that the library may report. For HTTP communication this path may be a redirect but for all others it is a direct path. The port may be vendor specific unless otherwise designated in the specification for that service.

Table 14: Service Types

Service Type	Service Type Name	Description	Protocol	Scheme
00h	Reserved
01h	Reserved
02h	Diagnostics	Service Web Interface	HTTP	service
02h	Diagnostics	Secure Service Web Interface	HTTPS	service
03h	Management/Status¹	Library Web Interface	HTTP	http
03h	Management/Status	Secure Library Web Interface	HTTPS	https
03h	Status	Vendor Command Line Interface	Telnet	telnet
03h	Status	Secure Vendor Command Line Interface	SSH	ssh
04h	Reserved
05h	Code Download²	Library Firmware Download	FTP	ftp
05h	Code Download	Library Firmware Download	TFTP	tftp
05h	Code Download	Library Firmware Download	SFTP	sftp
05h	Code Download	Drive Firmware Download	FTP	dftp
05h	Code Download	Drive Firmware Download	TFTP	dtftp
05h	Code Download	Drive Firmware Download	FTP	dsftp
1. The library web interface service is required if this page is supported. 2. The default behavior for "Code Download" network services shall be to apply the new firmware and perform any necessary reconfiguration to apply that firmware. The device may support applying the firmware at the next power cycle and may designate such "postponed" download by reporting another network service and pre-pending a "p" to the scheme (for example: pftp).

Vendor Specific Device Capabilities Page (C8h)

Fifth page code supported. Indicates if device server supports advanced failover or basic failover.

Note: This page may not be supported by all library models.

Table 15: Vendor Specific Device Capabilities Page

Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Identifier			Peripheral Device Type
1	Page Code (C8h)
2	MSB	Page Length (4)						LSB
3	MSB	Page Length (4)						LSB
4	Reserved					ADVFO	BASICFO	RSVD
5	Reserved						Reserved
6	Reserved				Reserved
7	Reserved
7	Reserved

Field	Description
Peripheral Qualifier	The return value of 000b indicates that the library is a single LUN device. If a LUN other than 00000b was specified, this field returns 011b which indicates that only LUN 0 is supported.
Peripheral Device Type	For media changer device logical units, this field returns 01000b (08h) to indicate it is a media changer device. Any LUN other than 0 returns 11111b which indicates that the device is unknown.
Page Code	Returned as C8h, indicating this page.
Page Length	Returns 4, indicating the remaining number of bytes following this field.
ADVFO	An advanced failover (ADVFO) bit set to one indicates the device server supports advanced path failover. An advanced failover (ADVFO) bit set to zero indicates the device server does not support advanced path failover.
BASICFO	– A basic failover (BASICFO) bit set to one indicates the device server supports basic path failover. A BASICFO bit set to zero indicates support for basic path failover is not supported.

Implemented Vendor Specific Command Page (E1h)

**Table 5:**
Implemented Vendor Specific Command Page (E1h)
Bit Byte	7	6	5	4	3	2	1	0
0	Peripheral Qualifier			Peripheral Device Type
1	Page Code (E1h)
2	Reserved
3	Page Length
4	INITIALIZE ELEMENT STATUS WITH RANGE
4	INITIALIZE ELEMENT STATUS WITH RANGE

Peripheral Qualifier – The return value of 000b indicates that the library is a single LUN device. If a LUN other than 00000b was specified, this field returns 011b which indicates that only LUN 0 is supported.

Peripheral Device Type – For media changer device logical units, this field returns 01000b (08h) to indicate it is a media changer device. Any LUN other than 0 returns 11111b which indicates that the device is unknown.

Page Code – Returned as E1h, indicating this page.

Page Length – Returns 1, indicating the remaining number of bytes following this field.

Implemented Vendor Specific Commands – The remaining bytes list the implemented vendor specific commands for the library. For the command code associated with each command, refer to SCSI Command Support.

Failover Key Page (FFh)

The contents of this page are not specified in this document.