A fix is available
APAR status
Closed as program error.
Error description
This APAR addresses a possible disk I/O error. This error may happen only when all of the following are true: - The disk is an "Asynchronous" access device that has optimized and non-optimized paths. - The disk is attached using 16GB FC or 10GB FCoE adapters - The disk is using the AIX default PCM - The disk is using the round_robin or shortest_queue path selection algorithm - Errors occur in the SAN that simultaneously affect all of the optimized paths to the disk. If I/O fails under these conditions, there will be an error report entry with label SC_DISK_ERR3 and the first line of the "SENSE DATA" will end with 0200 0400 0000 0000.
Local fix
Problem summary
This APAR addresses a possible disk I/O error. This error may happen only when all of the following are true: - The disk is an "Asynchronous" access device that has optimized and non-optimized paths. - The disk is attached using 16GB FC or 10GB FCoE adapters - The disk is using the AIX default PCM - The disk is using the round_robin or shortest_queue path selection algorithm - Errors occur in the SAN that simultaneously affect all of the optimized paths to the disk. If I/O fails under these conditions, there will be an error report entry with label SC_DISK_ERR3 and the first line of the "SENSE DATA" will end with 0200 0400 0000 0000.
Problem conclusion
Modified the SCSI disk driver to be less aggressive failing I/O that has been switched between different paths too many times. Modified the AIX default PCM to improve the handling of specific errors from the drivers for the new FC adapters.
Temporary fix
Comments
6100-07 - use AIX APAR IV58338 6100-08 - use AIX APAR IV57954 6100-09 - use AIX APAR IV55724 6100-09 - use AIX APAR IV55724 6100-09 - use AIX APAR IV55724 7100-01 - use AIX APAR IV57675 7100-02 - use AIX APAR IV57039 7100-03 - use AIX APAR IV55668 7100-04 - use AIX APAR IV55731
APAR Information
APAR number
IV57954
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-03-28
Closed date
2014-03-28
Last modified date
2016-05-10
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 U866915
UP14/08/08 I 1000
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Document Information
Modified date:
10 May 2016