Persistent Reserve In
168 SL150 Interface Reference Manual Julyl 2017
TABLE 4-88 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, 6h, and 8h.
3h = Exclusive Access:
This value indicates that the initiator holding the persistent reservation has
exclusive access.
Some commands (such as Move Medium) are only allowed for the
persistent reservation holder.
6h = Exclusive Access, Registrants Only:
This value indicates that any currently registered initiator has exclusive
access. Some commands (such as Move Medium) are only allowed for
registered I_T nexuses.
8h = Exclusive Access, Registrants Only: This value indicates that any
currently registered initiator has exclusive access. Some commands (such
as Move Medium) are only allowed for registered I_T nexuses.
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