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Generation The value in this field is a 32-bit counter in the device server that is
incremented each time a PERSISTENT RESERVATION OUT
command requests a Register, Clear, Pre-empt, or Pre-empt and
Clear operation. Note that PERSISTENT RESERVATION IN
commands do not increment the counter, nor do PERSISTENT
RESERVATION OUT commands that perform a Reserve or Release
service action, or by a PERSISTENT RESERVATION OUT command
that is not done due to an error or a reservation conflict. The value in
the Generation field is set to 0 as part of the power on or reset
processes.
The value in the Generation field allows the application client that
examines the value to verify that the configuration of the initiators
attached to a logical unit has not been modified by another application
client without any notification of the application client doing the
examination.
Additional
Length
This field contains the count of the number of bytes that are in the
Reservation Key list (bytes 8 – Q). Note that this field contains the
number of bytes in the reservation key list regardless of the value
prescribed by the Allocation Length field in the command’s CDB.
Reservation
Keys
Each of the Reservation Keys appear as items in a list as bytes 8
through Q. Each entry reflects an 8-byte reservation key registered
with the device server via the PERSISTENT RESERVATION OUT,
Reserve, Pre-empt, Pre-empt and Clear, or Register service actions.
Each key can be examined by the application client for correlation
with a set of initiators and SCSI ports.
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