A fix is available
APAR status
Closed as program error.
Error description
If there are multiple adapters in use to provide paths to an hdisk, and the hdisk is opened while the LUN is unmapped from one of those adapters (thus returning 05/2500 SCSI sense), then the AIX MPIO code may recover the path too quickly after the open. This could lead to the PCM selecting that unusable path, and possibly having the path fail and recover repeatedly.
Local fix
Problem summary
If there are multiple adapters in use to provide paths to an hdisk, and the hdisk is opened while the LUN is unmapped from one of those adapters (thus returning 05/2500 SCSI sense), then the AIX MPIO code may recover the path too quickly after the open. This could lead to the PCM selecting that unusable path, and possibly having the path fail and recover repeatedly.
Problem conclusion
Modified SCSI disk driver to properly report status of a path open when the storage device returns 05/2500 sense data to the Test Unit Ready command.
Temporary fix
Comments
6100-08 - use AIX APAR IV70106 6100-09 - use AIX APAR IV69311 7100-02 - use AIX APAR IV70317 7100-03 - use AIX APAR IV69309
APAR Information
APAR number
IV70317
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2015-02-28
Closed date
2015-02-28
Last modified date
2015-09-30
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 V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U866513
UP15/09/21 I 1000
PTF to Fileset Mapping
U866513 devices.fcp.disk.rte 7.1.2.21
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Document Information
Modified date:
30 September 2015