Persistent Reserve In
172 SL500: Interface Reference Manual • July 2008 Revision: F • 96122
TABLE 6-61 Reservation Descriptors Format
Byte
Bit
76543210
0
to
7
(MSB) Reservation Key
(LSB)
8
to
11
(MSB)
Obsolete
(LSB)
12 Reserved (00h)
13 Scope Type
14
to
15
Obsolete (00h)
Reservation Descriptors Format Definitions:
Reservation Key This value indicates the reservation key for the descriptor data that follows.
Scope The value in the Scope field indicates whether a persistent reservation applies
to an entire logical unit or to an element. The only valid value is 0h.
0h = The persistent reservation applies to the logical unit
Type This value specifies the characteristics of the persistent reservation.
Valid values are 3h and 6h.
■ 3h = Exclusive Access:
This value indicates that the initiator holding the persistent reservation has
exclusive read and write access. If any other initiator requests a data transfer
to or from the target, the result will be a reservation conflict.
■ 6h = Exclusive Access, Registrants Only:
This value indicates that any currently registered initiator has exclusive read
and write access.
If any non-registered initiator requests a data transfer to or from the target, the
result will be a reservation conflict.
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