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6.Command Specification
SCOPE: The value in this field indicates whether a persistent reservation applies to an entire logical unit ot an
element. The value in this filed are defined in table 6-52.
Code
0h
Logical Unit
1h
2h
Element (not supported in this drive)
3h-fh
Reserved
Logical Unit: A SCOPE value of Logical Unit indicates that the persistent reservation applies to the entire logical
unit. The Logical Unit scope shall be implemented by all device server that implement PERSISTENT RESERVE
OUT.
Element: ASCOPE filed value of Element indicates that the persistent reservation applies to the element of the
logical unit defined by the SCOPE-SPECIFIC Address field in the PERSISTENT RESERVE OUT parameter list.
The drive do not support it.
TYPE: The value in the TYPE filed specify the characteristics of the persistent reservation being established for all
data blocks within the element or within the logical unit. Table 6-53 defines the characteristic of the different type
values. For each persistent reservation type, table 6-53 lists code value and describes the required device server
support. In this table, the description of required device server support is divided in two paragraphs. The first
paragraph defines the required handling for read operations. The second paragraph defines the required handling
for write operations.
Code
Name
0h
1h
Write
Exclusive
2h
3h
Exclusive
Access
4h
5h
Write
Exclusive-
Registrants
Only
6h
Exclusive
Access-
Registrants
Only
(not
supported in
this drive)
7h-Fh
Reserved
6-62
Table 6-52: PERSISTENT RESERVATION SCOPE Codes
Name
Persistent reservation applies to the full logical unit
Obsolete
Persistent reservation applies to the specified element
Reserved
Table 6-53: PERSISTENT RESERVATION TYPE Codes
Obsolete
Reads Shared: Any application client on any initiator may execute tasks that request
transfers from the storage medium or cache of the logical unit to the initiator.
Writes Exclusive: Any task from any initiator other than the initiator holding the
persistent reservation that requests a transfer from the initiator to the storage medium
or cache of the logical unit shall result in a reservation conflict.
Obsolete
Reads Exclusive: Any task from any initiator other than the initiator holding the
persistent reservation that requests a transfer from the storage medium or cache of
the logical unit shall result in a reservation conflict.
Write Exclusive: Any task from any initiator other than the initiator holding the
persistent reservation that requests a transfer from the initiator to the storage medium
or cache of the logical unit shall result in a reservation conflict.
Obsolete
Reads Shared: Any application client on any initiator may execute tasks that request
transfers from the storage medium or cache of the logical unit to the initiator.
Writes Exclusive: Any task from any initiator other than the initiator holding the
persistent reservation that requests a transfer from the initiator to the storage medium
or cache of the logical unit shall result in a reservation conflict.
Reads Exclusive: A task that requests a transfer from the storage medium or cache
of the logical unit to an initiator that has not previously requested a REGISTER
service action with the drive shall result in a reservation conflict.
Write Exclusive: Any task from any initiator other than the initiator holding the
persistent reservation that requests a transfer from the initiator to the storage medium
or cache of the logical unit shall result in a reservation conflict.
PERSISTENT RESERVE IN
Description
Description
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
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