lun paths managed by DMMP need to be manually rescanned during IBM SVC firmware upgrade

Solution Verified - Updated -

Issue

  • we have 4 paths for every SVC luns . When SVC starts upgrading, one of 2 SVC nodes went offline so that all luns would lose half of paths , then after this node finished its upgrade , the paths we lost would return online automatically. Then IO can failback to these returned paths , the other SVC node could go offline for upgrade safely.
  • In previous version of RHEL, e.g. RHEL6, RHEL7.0 paths managed by DMMP returns automatically so that SVC upgrade can proceed without intervention.
  • In RHEL7.1 , I found the lost paths didn't return to be managed by DMMP unless we issue a rescan command.

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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