Quantum ATL SuperLoader ATL, User Manual

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Chapter 3 Media Changer Commands
Persistent Reserve In Command (5Eh)
92 Quantum ATL SuperLoader Software Interface Guide
Table 40
Persistent
Reserve In
Command
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 51 on page 93 and table 41 on page 94 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 52 on
page 95 and table 42 on page 96 for information about Read Reservations
parameter data.
Allocation
Length
This field indicates how much space has been reserved for the returned
parameter list (Read Keys or Read Reservations 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 first portion of the list that does fit is returned. If it is determined that the
remainder of the list is required, the client should send a new PERSISTENT
RESERVE IN command with an Allocation Length field large enough to
contain the entire list of parameters.