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 73
Figure 47 Read Reservations
Parameters
Table 35 Read Reservations
Parameters
Bit
Byte76543210
0 - 3
(MSB)
Generation
(LSB)
4 - 7
(MSB)
Additional Length (n – 7)
(LSB)
8 - n
(MSB)
Reservation Descriptors
(LSB)
Field Name Description
Generation The value in this field is a 32-bit counter in the device server that is
incremented each time a
PERSISTENT RESERVE OUT command requests a
Register, Clear, Pre-empt, or Pre-empt and Clear operation. Note that
PERSISTENT RESERVE IN commands do not increment the counter, nor do
PERSISTENT RESERVE OUT commands that perform a Reserve or Release
service action, or by a
PERSISTENT RESERVE OUT command that is not done
due to an error or a reservation conflict. The value in the
Generation field is set
to 0 as part of the power on or reset processes.
The value in the
Generation field allows the application client that examines
the value to verify that the configuration of the initiators attached to a logical
unit has not been modified by another application client without any
notification of the application client doing the examination.