Maxtor Atlas 10K V Product Manual page 140

Table 5-113
Data Field
Service actions that require information about persistent reservation and registrations may require
Service Action enabling of nonvolatile memory within the logical unit.
Service action codes available are:
Code
00h
01h
02h
03h
04h
05h
06 – 1Fh
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.
Scope
The values for the Scope field are:
Code
3h – Fh
The value of the Type field specifies the characteristics of the persistent reservation being estab-
Type lished for all data blocks within the extent or within the logical unit. Refer to Table 5-115 for the
applicable Type codes and their meanings
Fields contained in the PERSISTENT RESERVATION OUT parameter list specify the reservation
Parameter List keys and extent information required to perform a persistent reservation service action.
Length
The parameter list is 24 bytes in length; the Parameter List Length field contains 24 (18h) bytes.
5-82 Maxtor Atlas 10K V
PERSISTENT RESERVATION OUT Command-Field Descriptions
Name
Register
Reserve
Release
Clear
Pre-
empt
Pre-
empt &
Clear
Re-
served
Refer to Table 5-114 for detailed descriptions of each of the service action codes.
Name
0h LU
1h Extent
2h Element
Re-
served
Description
Description
Register a reservation key with the device server
Create a persistent reservation using a reservation key
Release a persistent reservation
Clear all reservation keys and all persistent reservations
Pre-empt persistent reservations from another initiator
Pre-empt persistent reservations from another initiator and
clear the task set for the pre-empted initiator
Reserved
Description
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.
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.
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.
Reserved