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Chapter 4 SCSI Commands
PERSISTENT RESERVE OUT Command (5Fh)
DLT-S4 Interface Reference Guide
231
Table 127
PERSISTENT
RESERVE OUT
Command with
REGISTER AND MOVE
Service Action Parameter List
— Field Descriptions
Field
Description
Reservation Key
The
RESERVATION KEY
field contains an 8-byte value provided by the
application client to the device server to identify the I_T nexus that is the
source of the
PERSISTENT RESERVE OUT
command. The device server
verifies that the contents of the RESERVATION KEY field in a
PERSISTENT
RESERVE OUT
command parameter data matches the registered reservation
key for the I_T nexus from which the command was received. If a
PERSISTENT RESERVE OUT
command specifies a
RESERVATION KEY
field
other than the reservation key registered for the I_T nexus, the device server
returns a
RESERVATION CONFLICT
status.
Service Action
Reservation Key
The
SERVICE ACTION RESERVATION KEY
field contains the reservation key to
be registered to the specified I_T nexus.
APTPL
If the last valid APTPL bit value received by the device server is zero, the loss
of power in the SCSI target device releases the persistent reservation for the
logical unit and remove all registered reservation keys. If the last valid APTPL
bit value received by the device server is one, the logical unit retains any
persistent reservation(s) that may be present and all reservation keys (i.e.,
registrations) for all I_T nexuses even if power is lost and later returned.
UNREG
An
UNREG
bit set to one specifies that the device server removes the
registration for the I_T nexus on which the
PERSISTENT RESERVE OUT
command
REGISTER AND MOVE
service action was received.
If the
UNREG
bit is set to zero, the registration for the I_T nexus that originated
the
PERSISTENT RESERVE OUT
command is not affected.
Relative Target Port
Identifier
The
RELATIVE TARGET PORT IDENTIFIER
field specifies the relative port
identifier of the target port in the I_T nexus to which the persistent reservation
is to be moved.
TransportID Descriptor
Length
The
TRANSPORTID DESCRIPTOR LENGTH
field specifies the number of bytes
of the TransportID that follows, is a minimum of 24 bytes, and is a multiple of
4.