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Command Specifications
4.1.10 RESERVE (16)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'16'
1 0 0 0 3rd Pty 3rd Pty Dev ID 0
2
× × × × × × × ×
3
× × × × × × × ×
4
× × × × × × × ×
5 0 0 0 0 0 0 0 0
Together with the RELEASE command, this command controls exclusive access
to the logical unit (HDD) under a multi-initiator environment.
The HDD is reserved by this command for the INIT which issued this command.
The values specified in bytes 2 to 4 of the CDB have no meaning and are
disregarded, but it is preferable that the INIT specify X'00' in these bytes.
(1) Logical unit reserve function
This command reserves the entire HDD (logical unit) for use as a special SAS device.
The reserve state established by this command is maintained until any one of the
following conditions occurs.
1) Reserve is released by a RELEASE command from the INIT that issued this
command.
2) Receiving HARD RESET primitive from any INIT.
3) Switching the HDD's power off or on.
When an HDD is reserved for any SAS device, if this command is issued by an
INIT that doesn't have the "Reserve Right" for that HDD, this command is
terminated with a RESERVATION CONFLICT status.
After the Reserved status is established, a command issued by an INIT other than the
device that reserved the HDD is rejected, except an INQUIRY, REQUEST SENSE,
REPORT LUNS, or RELEASE command, and a RESERVATION CONFLICT
status is reported to the INIT that issued that command. A RELEASE command is
the release operation specified in a RELEASE command issued to the HDD by a SAS
device which does not have the Reserve Right is disregarded.
180 C141-C013