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SCSI Description
Maxtor Atlas 10K III 5-97
PERSISTENT RESERVATION OUT Command-Field Descriptions
Service Ac-
tion
Service actions that require information about persistent reservation and registrations
may require enabling of nonvolatile memory within the logical unit.
Service action codes available are:
00h
Regis-
ter
Register a reservation key with the device server
01h
Re-
serve
Create a persistent reservation using a reservation key
02h
Re-
lease
Release a persistent reservation
03h Clear
Clear all reservation keys and all persistent reserva-
tions
04h
Pre-
empt
Pre-empt persistent reservations from another initiator
05h
Pre-
empt &
Clear
Pre-empt persistent reservations from another initiator
and clear the task set for the pre-empted initiator
06 – 1Fh
Re-
served
Reserved
Refer to Table 5-120 for detailed descriptions of each of the service action codes.
Scope
The value in this field indicates whether a persistent reservation applies to an entire
logical unit, to a part of the logical unit (defined as an extent), or to an element.
The values for the Scope field are:
0h LU
Logical Unit. Persistent reservation applies to the full
logical unit. The LU scope is therefore implemented by
all device servers that implement PERSISTENT RESER-
VATION OUT.
1h Extent
Persistent reservation applies to the specified extent.
When Extent is the scope, it indicates that the persis-
tent reservation applies to the extent of the logical unit
defined by the Scope-Specific Address and Extent
Length fields in the PERSISTENT RESERVATION OUT
command’s parameter list. Note that an extent is de-
fined only for devices defining contiguous logical block
addresses. The Extent scope is optional for all device
servers that implement PERSISTENT RESERVATION
OUT.
2h
Ele-
ment
Persistent reservation applies to the specified element.
When Element is the scope, it indicates that the persis-
tent reservation applies to the element of the logical
unit defined by the Scope-Specific Address field in the
PERSISTENT RESERVATION OUT parameter list. An
element is as defined by the SCSI-3 Medium Changer
Commands (SMC) standard. The Element scope is op-
tional for all device servers that implement PERSIS-
TENT RESERVATION OUT.
3h – Fh
Re-
served
Reserved