IV13288: PCM NOT FAILING BACK TO HIGH PRIORITY PATH APPLIES TO AIX 5300-12

APAR status

• Closed as program error.

Error description

• When a higher priority path recovers after failure the
  IO does not fail back to it. errpt shows path recovery
  ok.
  

Local fix

• Change the path priority to force them to be
  re-evaluated.
  e.g. if vscsi0 has priority = 1 and vscsi1 has priority =
  2,
  and vscsi0 is not getting selected:
  
  # chpath -l hdisk0 -p vscsi1 -a priority=1
  # chpath -l hdisk0 -p vscsi1 -a priority=2
  

Problem summary

• When a higher priority path recovers after failure the
  IO does not fail back to it. errpt shows path recovery
  ok.
  

Problem conclusion

• When path priorites are reevaluated for all the paths on a
  path coming back online, account for both fail over and round
  robin cases.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV12429

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  AIX 5.3

• Fixed component ID

  5765G0300

Applicable component levels

• R530 PSY

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