A fix is available
APAR status
Closed as program error.
Error description
An AIX or VIOS update to AIX 6.1 TL08 or 7.1 TL02 - based versions overrides custom DS8k hdisk attributes. Custom values like reserve_policy & algorithm set to no_reserve & round_robin for example are reverted back to the default values single_path & fail_over for a new DS8k ODM uniquetype 'PCM/friend/aixmpiods8k'. The same is true for any/all other customized disk attributes - not just the examples provided here. ALL existing/configured DS8K disks will revert back to default disk attributes upon upgrade of AIX or VIOS. This does not apply to SDDPCM configurations. It affects only DS8k configurations with 'PCM/friend/fcpother' uniquetype and some custom DS8k hdisk attributes. This applies only to DS8K. No other storage type is impacted. It applies only to DISK attributes - not to customized adapter attributes.
Local fix
Prior to the AIX or VIOS upgrade, save the lsattr -El output of all DS8K disks with customized disk attributes. (NOTE: a snap saved off prior to the upgrade will contain that information.) After the upgrade, manually change the attributes back to the desired custom settings.
Problem summary
When updating to AIX 6.1 TL 8 or 7.1 TL 2, DS8K disks managed by AIX PCM will migrate from "disk/fcp/mpioosdisk" ODM unique type to "disk/fcp/aixmpiods8k" uniquetype. In the process of the ODM uniquetype migration existing customized DS8K disk instances may have their customized attributes (CuAt's) deleted resulting in the disk attributes reverting to the default settings. "disk/fcp/mpioosdisk" and "disk/fcp/aixmpiods8k" have similar default attribute values. Worst case this could result in the reserve_policy reverting back to "single_path" after an update. If a disk is accessed after the update in a clustered,shared environment after the update and the reserve_policy has reverted, then it can result in other hosts encountering reservation conflicts when accessing the shared disk. This issue does not affect DS8K disks managed by SDDPCM.
Problem conclusion
Preserve customized attribute values for DS8K disks when migrating ODM uniquetype from "disk/fcp/mpioosdisk" to "disk/fcp/aixmpiods8k" due to an AIX update.
Temporary fix
Comments
APAR Information
APAR number
IV45777
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2013-07-17
Closed date
2013-07-31
Last modified date
2014-02-17
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 U859543
UP14/02/17 I 1000
PTF to Fileset Mapping
U859543 devices.common.IBM.scsi.rte 6.1.8.17
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Document Information
Modified date:
17 February 2014