Persistent Reserve In
96122 • Revision: F Chapter 6 SCSI Commands 171
Read Reservations Data
The Read Reservations service action requests that the initiator return a description
of all current Reservation keys it has registered.
See TABLE 6-60 for the format of the parameter data returned in response to a
Persistent Reserve In command with the Read Reservations service action.
TABLE 6-60 Read Reservations Data
Byte
Bit
76543210
0
to
3
(MSB)
Generation
(LSB)
4
to
7
(MSB)
Additional Length (n-7)
(LSB)
8
to
n
(MSB)
Reservation Descriptors
(LSB)
Read Reservations Data Definitions:
Generation This value is a 32-bit counter that is incremented every time a Persistent
Reserve Out command requests a Register, a Clear, a Preempt, or a Preempt
and Abort operation.
It allows the library to verify that its configuration of initiators has not been
illegally modified.
Additional Length This field indicates the number of bytes in the list of reservation descriptors.
Reservation Descriptors Each persistent reservation for a logical unit has one reservation descriptor that
has the format shown in TABLE 6-61.
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