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SCSI Commands Reference Manual, Rev. J 133
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
APTPL (Activate Persist Through Power Loss) bit
1 The Activate Persist Through Power Loss (APTPL) bit set to one is optional. If a device server that does not support an APTPL bit set to
one receives that value, it shall return CHECK CONDITION status, with the sense key set to ILLEGAL REQUEST, and the additional sense
code set to INVALID FIELD IN PARAMETER LIST. If the last valid APTPL bit value received by the device server is one, the logical unit shall
retain 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 (see SPC-5).
0 If the last valid APTPL bit value received by the device server is zero, the loss of power in the SCSI target device shall release the per-
sistent reservation for the logical unit and remove all registered reservation keys (see SPC-5).
UNREG (Unregister) bit
0 The unregister (UNREG) bit set to zero specifies that the device server shall not unregister the I_T nexus on which the PERSISTENT
RESERVE OUT command REGISTER AND MOVE service action was received.
1 An UNREG bit set to one specifies that the device server shall unregister the I_T nexus on which the PERSISTENT RESERVE OUT command
REGISTER AND MOVE service action was received.
RELATIVE TARGET PORT IDENTIFIER field
The RELATIVE TARGET PORT IDENTIFIER field specifies the relative port identifier of the target port in the I_T nexus to which the persistent res-
ervation is to be moved.
TRANSPORTID DESCRIPTOR LENGTH field
The TRANSPORTID DESCRIPTOR LENGTH field specifies the number of bytes of the TRANSPORTID that follows, shall be a minimum of 24 bytes,
and shall be a multiple of 4.
TRANSPORTID field
The TRANSPORTID field specifies the initiator port in the I_T nexus to which the persistent reservation is to be moved. The format of the Trans-
portID is defined in SPC-5.
The command shall be terminated with CHECK CONDITION status, with the sense key set to ILLEGAL REQUEST:
a) If the value in the PARAMETER LIST LENGTH field in the CDB does not include all of the parameter list bytes specified by the TRANSPOR-
TID PARAMETER DATA LENGTH field; or
b) If the value in the TRANSPORTID PARAMETER DATA LENGTH field results in the truncation of a TransportID.