Reference Guide

Chapter 4 SCSI Commands
PERSISTENT RESERVE IN Command (5Eh)
DLT-S4 Interface Reference Guide 210
READ KEYS Service
Action
4
Figure 109 and table 115 illustrate and describe the data fields of Read
Key data parameters.
01h Read Reservation Reads all current persistent reservations.
02h Report Capabilities Returns persistent reservation capability information.
A Read Keys service action requests that the drive return a parameter list that includes a
header and a complete list of all of the reservation keys currently registered with the
drive.
If multiple initiators have
registered with the same key,
the key is listed multiple
times, once for each
registration.
See figure 109
and table 115 for information about Read
Keys parameter data. See REPORT CAPABILITIES
Service Action on page 216.
A Read Reservation service
action requests that the drive
return a parameter list that
contains a header and a
complete list of all persistent
reservations presently active
in the drive.
See figure 110
and table 116 for information about Read
Reservation parameter data. See REPORT
CAPABILITIES Service Action on page 216.
Allocation
Length
This field indicates how much space is reserved for the returned parameter list (Read
Keys or Read Reservation parameters). The actual length of the parameter data is
indicated in the parameter data field for those parameters.
If the Allocation Length is not sufficient to contain the entire list of parameters, the drive
returns a truncated list. If the remainder of the list is required, the host must send a new
PERSISTENT RESERVE IN command with an Allocation Length field value large enough
to contain the entire list of parameters.
Field Description