User's Guide

Chapter 2 Media Changer Commands
Persistent Reserve In Command (5Eh)
Quantum SuperLoader 3 Software Interface Guide 70
Table 33 Persistent Reserve
In Command
Note: The original SCSI specification allowed users to specify the
LUN (Logical Unit Number) in bits 7 - 5 in byte 1. Systems still
set the LUN on the initial
INQUIRY when talking to a newer
than SCSI-2 device. There are systems/drivers in the field that
set the legacy LUN field in all CDBs. HP drives ignore the
legacy LUN field in all CDBs that identify bits 7 - 5 in byte 1 as
reserved. These values will vary depending on the drive type.
Field Name Description
Service
Action
Service actions that require information about persistent reservation and
registrations may require enabling of nonvolatile memory within the logical
unit.
Service action codes available are:
Code Name Description
00h Read Keys Reads all registered reservation keys
01h Read Reservations Reads all current persistent reservations
02-1Fh Reserved Reserved
A
Read Keys service action requests that the device server return a parameter
list that includes a header and a complete list of all of the reservation keys
currently registered with the device server. If multiple initiators have registered
with the same key, then the key is listed multiple times, once for each
registration. Refer to figure 46
and table 34 for information about Read Keys
parameter data.
A
Read Reservation service action requests that the device server return a
parameter list that contains a header and a complete list of all persistent
reservations that are presently active in the device server. Refer to figure 47
on
page 73 and table 35
on page 73 for information about Read Reservations
parameter data.