Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
148
Hitachi Confidential
17.13.1 Service Action
The following service action codes are implemented. If a code which is not supported or a reserved code is specified, the drive
returns a
Check Condition
status. The sense key is set to
Illegal Request
and the additional sense data is set to
Invalid Field in
CDB
. In case of PERSISTENT RESERVE OUT command executing a Register service action, this field is ignored.
Table 100: PERSISTENT RESERVE OUT, Service Action Code
•
Register
This service action may conflict with a successfully established persistent reservation.
If the key specified in the reservation key field is not registered yet, a key specified in the Service Action Reservation
Key is registered as new key. If the key is already registered but the Initiator which registered the key is different
from the Initiator requesting the command, the drive returns
Reservation Conflict
status. If the key is already regis-
tered and the key is for the Initiator requesting the command, the key is replaced with new key specified in the Ser-
vice Action Reservation Key field.
Up to four keys can be held at the same time. When four keys are already registered, PERSISTENT RESERVE OUT
command with Register service action which does not replace an existing key is rejected with
Reservation Conflict
status.
When PERSISTENT RESERVE OUT command with Register service action completes successfully, the Generation
counter is incremented.
When keys are registered, the drive returns
Reservation Conflict
status against the RESERVE command and the
RELEASE command.
Code
Name
Description
Support
00h
Register
Register a reservation key with the device server
Yes
01h
Reserve
Create a persistent reservation using a reservation key
Yes
02h
Release
Release a persistent reservation
Yes
03h
Clear
Clear all reservation keys and all persistent reservations
Yes
04h
Preempt
Preempt persistent reservations from another Initiator
No
05h
Preempt and Abort
Preempt persistent reservations from another Initiator
and clear the task set for the preempted Initiator
Yes
06h
Register and
Ignore existing key
Register a reservation key with the drive
Yes
07h
-
1Fh
Reserved
Reserved
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