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4-26 C156-E224-01EN
4.3.8 RELEASE command
Table 4.40 RELEASE command
Bit
Byte
76543210
0 Operation Code (17h)
1LUN Reserved
2-5 Reserved
The RELEASE command releases the ODD reserved by the INIT that issued this
command. When any of the following conditions is met, the command ends with
GOOD status but it does not affect the reserved status of the ODD:
• The reserved status created by the INIT that has issued this command is not in
the ODD.
• The reserved status of the type of release target specified by CDB of this
command is not in the ODD.
• The specified ODD may is reserved for another SCSI device.
Any values specified for CDB bytes 1 to 5 are ignored. However, INIT should
specify 00h for these bytes.
In terms of the entire ODD (logical unit), the RELEASE command releases any
reserved status for which the INIT that issued the command has reservation
authority.
4.3.9 REQUEST SENSE command
Table 4.41 REQUEST SENSE command
Bit
Byte
76543210
0 Operation Code (03h)
1LUN Reserved
2-3 Reserved
4 Allocation Length
5 Reserved
The REQUEST SENSE command transfers sense data to the INIT. Sense data
indicates detailed error information related to the command for which an error was
previously reported. If no error was previously reported for a command, Sense
Key indicates NO SENSE.
When issuing the REQUEST SENSE command to detect the device status, first
issue the TEST UNIT READY command, then issue the REQUEST SENSE
command.
Allocation Length specifies the length of sense data to be transferred, in bytes. If
0 is specified, the command does not transfer any data and ends normally.