Product manual

SCSI Description
5-80 Maxtor Atlas 10K IV
Table 5-115 PERSISTENT RESERVATION OUT Command-Field Descriptions
Data Field Description
Service Action
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:
Code
Name Description
00h Register Register a reservation key with the device server
01h Reserve Create a persistent reservation using a reservation key
02h Release Release a persistent reservation
03h Clear Clear all reservation keys and all persistent reservations
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 5-116 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:
Code
Name Description
0h LU
Logical Unit. Persistent reservation applies to the full logical
unit. The LU scope is therefore implemented by all device serv-
ers that implement PERSISTENT RESERVATION OUT.
1h Extent
Persistent reservation applies to the specified extent.
When Extent is the scope, it indicates that the persistent reser-
vation applies to the extent of the logical unit defined by the
Scope-Specific Address and Extent Length fields in the PER-
SISTENT RESERVATION OUT command’s parameter list.
Note that an extent is defined only for devices defining contig-
uous logical block addresses. The Extent scope is optional for
all device servers that implement PERSISTENT RESERVA-
TION OUT.
2h Element
Persistent reservation applies to the specified element.
When Element is the scope, it indicates that the persistent res-
ervation applies to the element of the logical unit defined by the
Scope-Specific Address field in the PERSISTENT RESERVA-
TION OUT parameter list. An element is as defined by the
SCSI-3 Medium Changer Commands (SMC) standard. The El-
ement scope is optional for all device servers that implement
PERSISTENT RESERVATION OUT.
3h – Fh
Re-
served
Reserved
Type
The value of the Type field specifies the characteristics of the persistent reservation being estab-
lished for all data blocks within the extent or within the logical unit. Refer to Table 5-117 for the
applicable Type codes and their meanings
Parameter List
Length
Fields contained in the PERSISTENT RESERVATION OUT parameter list specify the reservation
keys and extent information required to perform a persistent reservation service action.
The parameter list is 24 bytes in length; the Parameter List Length field contains 24 (18h) bytes.