Reference Guide

Chapter 4 SCSI Commands
PERSISTENT RESERVE OUT Command (5Fh)
DLT-S4 Interface Reference Guide 222
Table 123 PERSISTENT
RESERVE OUT Command’s
Service Action Descriptions
Code Name Description
00h Register When the command executes a Register service action, it registers a Reservation
Key with the drive without generating a reservation. The drive holds these
Reservation Keys from each initiator that performs a
PERSISTENT RESERVE OUT
command with a Register service action until a new
PERSISTENT RESERVE OUT
command with Register service action from the same initiator changes the key or
until the initiator registration is removed by any of the following:
• Powering down the drive, if the last Activate Persist Through Power Loss
(APTPL; see figure 114
on page 227 and table 125 on page 228) the drive
received was 0.
• Performing a Clear service action.
• Performing a Preempt service action.
• Performing a Preempt & Abort service action.
• Performing a Register service action from the same initiator with the value of
the service action Reservation Key set to 0.
When a Reservation Key has not yet been established or when the Reservation Key
has been removed, a Reservation Key of 0 is used when the initiator issues a
PERSISTENT RESERVE OUT
command with the Register service action. When the
reservation has been removed, no information is reported for the initiator in the
Read Keys service action of the resulting
PERSISTENT RESERVE IN command.
01h Reserve A
PERSISTENT RESERVE OUT command with Reserve service action creates a
persistent reservation with a specified Scope and Type.
Persistent reservations are not superseded by a new persistent reservation from
any initiator except by the execution of a
PERSISTENT RESERVE OUT command
that specifies a Release, Clear, Preempt, or Preempt & Abort service action.