SCSI Commands
Quantum DLT 8000 Tape System
5-151
PERSISTENT RESERVATION OUT Command (5Fh) (continued)
Table 5–67 PERSISTENT RESERVATION OUT Command’s Service Action Descriptions
(continued)
Code
Name
Description
02h
Release
A PERSISTENT RESERVATION OUT command with Release service action
removes a persistent reservation held by the same initiator.
The fields associated with a Release service action match fields of the active
persistent reservation. Sending of a PERSISTENT RESERVATION OUT command
that specifies a Release service action when no persistent reservation exists
from that initiator does not result in an error. Instead, the device server returns
a GOOD message without altering any other reservation: the reservation key is
not changed by the Release service action.
The device server returns a CHECK CONDITION status for any PERSISTENT
RESERVATION OUT command that specifies the release of a persistent
reservation held by the requesting initiator that matches some but not all of
the Scope, Type, Reservation Key, and extent values. The sense key is set to
ILLEGAL REQUEST and additional sense data is set to INVALID RELEASE OF
ACTIVE PERSISTENT RESERVATION. Attempts to release persistent reservations
in which none of the Scope, Type, Reservation Key, and extent values match an
existing persistent reservation held by the initiator making the request are not
errors.
An active persistent reservation may also be released by:
•
Powering off. When the most recent APTPL value received by the device
server is 0, a power-off performs a hard reset, clears all persistent
reservations, and removes all registered reservation keys;
or
•
Executing a PERSISTENT RESERVATION OUT command from another
initiator with a persistent reserve service action of Pre-empt or Pre-empt
and Clear.
Note that a Release service action should not be performed if any operations
interlocked by the persistent reservation have not yet completed.
03h
Clear
A PERSISTENT RESERVATION OUT command with a successful Clear service
action removes all persistent reservations for all initiators. All reservation keys
are also removed. Any commands from any initiator that have been accepted
by the device server as non-conflicting continue their normal executions.
A UNIT ATTENTION condition is established for all initiators for the cleared
logical unit. The sense key is set to UNIT ATTENTION; the additional sense data
is set to RESERVATIONS PREEMPTED.
Note that applications should not use the Clear action service except during
recoveries associated with initiator or system reconfiguration, since data
integrity may be compromised.
(continued)
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
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Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
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Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
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