Overview
CDB Example
Below is an example of a CDB from a messages file on a DXi system with 1.4.0.3 software. This information may display differently in other DXi software versions.
Oct 20 16:54:29 DA1QUDXI101 kernel: EQTMP Ser:VL01CXi CmdPtr:ffff81054d0082f8 IOSer:152128120 CMD:0x12 On aborting active cmd 1097 st 2 fl 0, ffff81054d0082f8 LUN: 0 tag:9114A78 llt: 4 CDB: 0x12 0 0 0 24 0 0 0 0 0 0 0 state: 0x1 [0:0:0:0:0] [0:0:0:0:3] flags: 1 t: 8053ms[S/0/115][S/115/116][S/116/0][S/0/1][P/0/1][P/1/2]
The CDB example above points to an INQUIRY since the Operation Code, the first parameter in the CDB, is 0x12. CDB structure and a list of the Operation Codes are listed below in the SCSI Command Operation Codes section. The entire CDB structure itself depends on the Operation Code and will not be covered here.
SCSI Command Operation Codes
List of SCSI command Operation Codes.
Code↓ Command↓
00 TEST UNIT READY (mandatory)
01 RECALIBRATE or REWIND
03 REQUEST SENSE (mandatory except RBC)
04 FORMAT UNIT
05 READ BLOCK LIMITS
07 REASSIGN BLOCKS
07 INITIALIZE ELEMENT STATUS
08 READ (6)
0A WRITE (6)
0B SEEK (6)
0F READ REVERSE (6)
10 WRITE FILEMARKS (6)
11 SPACE (6)
12 INQUIRY (mandatory)
13 VERIFY(6)
14 RECOVER BUFFERED DATA
15 MODE SELECT (6)
16 RESERVE (6)
17 RELEASE (6)
18 COPY
19 ERASE (6)
1A MODE SENSE (6)
1B START/STOP UNIT
1B LOAD UNLOAD
1C RECEIVE DIAGNOSTIC RESULTS
1D SEND DIAGNOSTIC
1E PREVENT/ALLOW MEDIUM REMOVAL
23 READ FORMAT CAPACITIES (MMC)
24 SET WINDOW
25 READ CAPACITY (10)
28 READ (10)
29 READ GENERATION
2A WRITE (10)
2B SEEK (10)
2C ERASE (10)
2D READ UPDATED BLOCK
2E WRITE AND VERIFY (10)
2F VERIFY (10)
30 SEARCH DATA HIGH (10)
31 SEARCH DATA EQUAL (10)
32 SEARCH DATA LOW (10)
33 SET LIMITS (10)
34 PRE-FETCH (10)
35 SYNCHRONIZE CACHE (10)
36 LOCK/UNLOCK CACHE (10)
37 READ DEFECT DATA (10)
37 INITIALIZE ELEMENT STATUS WITH RANGE
38 MEDIUM SCAN
39 COMPARE
3A COPY AND VERIFY
3B WRITE BUFFER
3C READ BUFFER
3D UPDATE BLOCK
3E READ LONG
3F WRITE LONG
40 CHANGE DEFINITION
41 WRITE SAME (10)
44 REPORT DENSITY SUPPORT
45 PLAY AUDIO (10)
46 GET CONFIGURATION
47 PLAY AUDIO MSF
4A GET EVENT STATUS NOTIFICATION
4B PAUSE / RESUME
4C LOG SELECT
4D LOG SENSE
50 XDWRITE (10)
51 XPWRITE (10)
52 XDREAD (10)
53 XDWRITEREAD (10)
54 SEND OPC INFORMATION
55 MODE SELECT (10)
56 RESERVE (10)
57 RELEASE (10)
58 REPAIR TRACK
5A MODE SENSE (10)
5B CLOSE TRACK / SESSION
5C READ BUFFER CAPACITY
5D SEND CUE SHEET
5E PERSISTENT RESERVE IN
5F PERSISTENT RESERVE OUT
7E EXTENDED CDB
7F VARIABLE LENGTH CDB
80 XDWRITE EXTENDED (16)
80 WRITE FILEMARKS (16)
81 REBUILD (16)
81 READ REVERSE (16)
82 REGENERATE (16)
83 EXTENDED COPY
84 RECEIVE COPY RESULTS
85 ATA COMMAND PASS THROUGH (16)
86 ACCESS CONTROL IN
87 ACCESS CONTROL OUT
88 READ (16)
89 COMPARE AND WRITE
8A WRITE (16)
8B ORWRITE
8C READ ATTRIBUTE
8D WRITE ATTRIBUTE
8E WRITE AND VERIFY (16)
8F VERIFY (16)
90 PRE-FETCH (16)
91 SYNCHRONIZE CACHE (16)
92 SPACE (16)
92 LOCK UNLOCK CACHE (16)
93 WRITE SAME (16)
9E SERVICE ACTION IN (16)
9F SERVICE ACTION OUT (16)
A0 REPORT LUNS
A1 ATA COMMAND PASS THROUGH (12)
A2 SECURITY PROTOCOL IN
A3 REPORT SUPPORTED OPCODES
A4 MAINTENANCE (OUT) (REPORT_KEY)
A5 MOVE MEDIUM
A6 EXCHANGE MEDIUM
A7 MOVE MEDIUM ATTACHED
A8 READ (12)
A9 SERVICE ACTION OUT (12)
AA WRITE (12)
AB SERVICE ACTION IN (12)
AC ERASE (12)
AD READ DVD STRUCTURE
AE WRITE AND VERIFY (12)
AF VERIFY (12)
B0 SEARCH DATA HIGH (12)
B1 SEARCH DATA EQUAL (12)
B2 SEARCH DATA LOW (12)
B3 SET LIMITS (12)
B4 READ ELEMENT STATUS ATTACHED
B5 SECURITY PROTOCOL OUT
B6 SEND VOLUME TAG
B7 READ DEFECT DATA (12)
B8 READ ELEMENT STATUS
B9 READ CD MSF
BA REDUNDANCY GROUP (IN)
BB REDUNDANCY GROUP (OUT)
BC SPARE (IN)
BD SPARE (OUT)
BE VOLUME SET (IN)
BF VOLUME SET (OUT)
Additional Information
Quantum
structure that displays in the messages file. This will focus on the first parameter which is the operation code.