Supported SCSI commands

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The following table lists all of the commands that are defined by the referenced SCSI-3 standard for medium changer devices. For each command, the operation code, applicable SCSI-3 standard, and applicable conditions are shown.

Table 1. Supported SCSI commands
Command name Operation code SCSI document Applicable conditions
RVC1 UAT2 NRD3
Exchange Medium X'A6' SMC4 Y5 Y Y
Initialize Element Status X'07' SMC Y Y Y
Initialize Element Status with Range X'E7' VU6 Y Y Y
Inquiry X'12' SPC7 N8 N N
Log Select (not supported) X'4C' SPC Y Y Y
Log Sense X'4D' SPC Y N N
Mode Select (6) X'15' SPC Y Y N
Mode Select (10) X'55' SPC Y Y N
Mode Sense (6) X'1A' SPC N Y Y9
Mode Sense (10) X'5A' SPC N Y Y9
Move Medium X'A5' SMC Y Y Y
Position to Element X'2B' SMC Y Y Y
Prevent Allow Medium Removal (not supported) X'4C' SPC Y Y Y
Read Buffer X'3C' SPC Y N N
Read Element Status X'B8' SMC N Y Y10
Receive Diagnostic Results (not supported) X'1C' SPC Y Y N
Release Element (6) X'17' SMC N Y N
Request Sense X'03' SPC N N N
Request Volume Element Address X'B5' SMC Y Y N
Reserve Element (6) X'16' SMC Y Y N
Rezero Unit (not supported) X'01' SPC Y Y N
Send Diagnostic X'1D' SPC Y Y Y
Send Volume Tag X'B6' SMC Y Y Y
Test Unit Ready X'00' SPC Y Y Y
Write Buffer X'3B' SPC Y Y N
Notes:
  1. RVC = Reservation Conflict status. When multiple logical libraries or control paths are configured, the library has multiple Medium Changer device ports (through LUN 1 of the drives). Medium changer device reservations prevent access for those initiators only by using the same device port as the initiator that sent the Reserve command. Initiators that use another device port (for example, for a different logical library or different control path) are not affected.
  2. UAT = CHECK CONDITION status for Unit Attention.
  3. NRD = CHECK CONDITION status for Not Ready.
  4. SMC = SCSI-3 Medium Changer specification.
  5. Y = Yes (command is checked for applicable conditions).
  6. VU = The command is unique to the vendor.
  7. SPC = SCSI Primary Commands-2 (SPC-2) specification.
  8. N = No (command is not checked for applicable conditions).
  9. The reporting of Not Ready conditions for Mode Sense (6) and Mode Sense (10) is limited to reset conditions with associated sense data of 2/0401.
  10. The reporting of Not Ready conditions for Read Element Status with DVCID=B'1' is limited to reset conditions with associated sense data of 2/0401.
Each SCSI command is detailed in the sections that follow. The tables in the descriptions of each SCSI command indicate the fields in each Command Descriptor Block (CDB). The tables are similar to the style used in the applicable SCSI-3 standard. The descriptions specify the supported options, values, and ranges for each field. For a description of a CDB and its fields, see the applicable SCSI-3 standard.
Note: The Logical Unit Number (LUN) field in the CDB is obsoleted in SCSI-3 and is ignored for every command.