User's Guide
Table Of Contents
- Preface
- Theory of Operation
- Media Changer Commands
- Overview of Command and Status Processing
- Media Changer Command Descriptions
- Initialize Element Status Command (07h)
- Inquiry Command (12h)
- Load Unload Command (1Bh)
- Log Sense Command (4Dh)
- Mode Select (6) / (10) Command (15h / 55h)
- Mode Sense (6) / (10) Command (1Ah/ 5Ah)
- Move Medium Command (A5h)
- Persistent Reserve In Command (5Eh)
- Persistent Reserve Out Command (5Fh)
- Position to Element Command (2Bh)
- Prevent/Allow Medium Removal (1Eh)
- Read Buffer Command (3Ch)
- Read Element Status Command (B8h)
- Release Element (10) Command (57h)
- Release Unit (6) Command (17h)
- Report Device Identifier Command (A3h)
- Report LUNS Command (A0h)
- Request Sense Command (03h)
- Reserve Element (10) Command (56h)
- Reserve Element (6) Command (16h)
- Send Diagnostic Command (1Dh)
- Set Device Identifier Command (A4h)
- Test Unit Ready Command (00h)
- Write Buffer Command (3Bh)
- Index
Chapter 2 Media Changer Commands
Persistent Reserve In Command (5Eh)
Quantum SuperLoader 3 Software Interface Guide 75
Table 36 Persistent Reserve In
Read Reservations Descriptor
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.
Field Name Description
Reservation Key The
Reservation Key field contains an 8-byte value that identifies the
reservation key under which the persistent reservation is held.
Scope-Specific
Address
Used to indicate the element that is the reservation affects when a
reservation is for an element rather than a logical unit. The SuperLoader 3
does not support reservations of elements, so this field is always 0.
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 39
on page 87 for the applicable
Type codes and their meanings.