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Fibre Channel Interface Manual, Rev. D 253
Type
This field determines the characteristics of the persistent reservation being established for all data blocks within the extent
or logical unit. The required device server support descriptions below are divided into two paragraphs. The first paragraph
defines the required handling for read operations. The second paragraph defines the required handling for write operations.
Type
Code Name Description
0h
Obsolete (no longer used)
1h
Write Exclusive
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 All tasks from any initiator other than the initiator holding the persistent reserva-
tion that requests a transfer from the initiator to the storage medium or cache of
the logical unit result in a reservation conflict.
2h
Obsolete (no longer used)
3h
Exclusive Access
Reads Exclusive All tasks from any initiator other than the initiator holding the persistent reserva-
tion that requests a transfer from the storage medium or cache of the logical unit
to the initiator result in a reservation conflict.
Writes Exclusive All tasks from any initiator other than the initiator holding the persistent reserva-
tion that requests a transfer from the initiator to the storage medium or cache of
the logical unit result in a reservation conflict.
4h
Obsolete (no longer used)
5h
Write Exclusive, Registrants Only
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 All tasks that request a transfer to the storage medium or cache of the logical
unit from an initiator that is not currently registered with the device server result
in a reservation conflict.
6h
Exclusive Access, Registrants Only
Read Exclusive All tasks 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 device server result in a reservation conflict.
Writes Exclusive All tasks that requests a transfer to the storage medium or cache of the logical
unit from an initiator that is not currently registered with the device server result
in a reservation conflict.
7h - Fh
Reserved
165