User's Guide

50 SCSI Commands
Allocation Length – This field specifies the byte length allowed for returning the requested data. The
number of bytes returned is the lesser of the available data to return or the allocation length.
Persistent Reserve In Response
Response data is returned depending on the requested service action.
Read Keys Response
The response for a Read Keys service action is shown the following table.
Generation – This field is a 32-bit counter that is incremented every time a PERSISTENT RESERVE OUT
command requests a Register, a Register and Ignore Existing Key, a Clear, a Preempt, or a Preempt and
Abort service action. This counter is not maintained across power cycles.
Additional Length – This field indicates the length in bytes of the Reservation Key List.
Reservation Key List – This is a list of all the 8-byte reservation keys that have been registered through
the PERSISTENT RESERVE OUT command.
Table 46 Read Keys Response
Bit
Byte
76543210
0
:
3
Generation
4
:
7
Additional Length (n-7)
Reservation Key List
8
:
15
First Reservation Key
:
n-7
:
n
Last Reservation Key