
Chapter 3 Media Changer Commands
Persistent Reserve In Command (5Eh)
98 Quantum ATL SuperLoader Software Interface Guide
The following table describes the available “Type” values from the
Type field of the PERSISTENT RESERVE IN Read Reservations
parameters.
Each of the codes provides handling instructions for READ
operations, for WRITE operations, and for subsequent attempts to
establish persistent reservations, referred to as “Additional
Reservations Allowed” in the table.
Scope The value in this field indicates whether a persistent reservation applies
to an entire logical unit, to a part of the logical unit (defined as an extent),
or to an element.
The values for the Scope field are:
Code Name Description
0h LU Logical Unit. Persistent reservation applies to the
full logical unit. The LU scope is therefore
implemented by all device servers that implement
PERSISTENT RESERVE OUT.
1h Obsolete
2h Element Persistent reservation applies to an element.
Reservations of elements. Is not supported.
3h - Fh Reserved Reserved
Type The value of the Type field specifies the characteristics of the persistent
reservation being established for all data blocks within the extent or
within the logical unit. Refer to table 46
on page 110 for the applicable
Type codes and their meanings.
Field Name Description
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