Julyl 2017 Command Set 25
4
Command Set
This chapter lists and describes the small computer system interface (SCSI) command
set for serial attached SCSI (SAS) and Fibre Channel (FC) interfaces to the SL150
Modular Library System.
TABLE 4-5 contains a list of the commands, command codes, and page numbers that
contain a description of the command.
Note – This manual does not describe the commands for tape drives. Refer to the
tape drive documentation for information about SCSI commands for a tape drive.
Implementation Requirements
The structure for all command descriptor blocks is:
The first byte contains a:
• Group Code that provides 8 groups of commands
• Command Code that provides 32 command codes for each group
The second byte in all command descriptor blocks:
• Starts the command parameters
Additional bytes:
• Contains command parameters
Last byte in all command descriptor blocks:
• Control byte
Note – The library is SCSI-3 compliant.
• For some commands,
a list of parameters accompanies the request during Data Out.
• For all commands,
if there is an invalid parameter in the command descriptor block, then the device
terminates the command without altering the medium.
Command Descriptor Block
Initiators use three types of CDBs to communicate commands to the targets:
• 6–Byte commands (TABLE 4-1)
• 10–Byte commands (TABLE 4-2)
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