A fix is available
APAR status
Closed as program error.
Error description
chdev will break the reserves on a lun regardless of the host that owns the lun. The code attempts to open the lun with no reserve and if that fails we will break the reserve.
Local fix
Problem summary
The disk change method currently sends out a LUN reset to clear any stale reserves any time that the reserve_policy is changed from either no_reserve or single_path to one of the PR reserve types. This occurs even if the "-P" flag is used on the chdev command. This could result in another host's reservation being unexpectedly cleared on a shared disk. The other host should receive a SCSI unit attention and re-establish the reservation.
Problem conclusion
Modify the SCSI disk change method so that the LUN reset is only sent if the local node has access to the disk. This proves that the disk is not reserved by another host, so the LUN reset will only clear a stale reserve owned by the local host.
Temporary fix
Comments
6100-08 - use AIX APAR IV63136 6100-09 - use AIX APAR IV64621 7100-02 - use AIX APAR IV64633 7100-03 - use AIX APAR IV64603
APAR Information
APAR number
IV64621
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-09-05
Closed date
2014-09-05
Last modified date
2015-01-21
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U861319
UP14/10/28 I 1000
PTF to Fileset Mapping
U861319 devices.common.IBM.disk.rte 6.1.9.30
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Document Information
Modified date:
21 January 2015