Storage paths not automatically recovered during IBM 2145 SAN controller upgrade

Solution Verified - Updated -

Issue

  • Storage paths not automatically recovered during IBM 2145 SAN controller upgrade.

  • We have performed a firmware update on one controller at a time on IBM 2145 SAN array but observed that after a reboot of storage controller, failed paths were not able to recover back automatically.

    After waiting for ~20 minutes for the path recovery, a manual SCSI bus re-scan was required to recover the paths:

    $ echo "- - -" > /sys/class/scsi_host/hostX/scan
    

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • IBM 2145 SAN/SVC/Storage array
  • device-mapper-multipath

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