During a SAN storage software upgrade, paths failed and did not recover

Solution Verified - Updated -

Issue

During a SAN storage software upgrade, all paths to the storage failed and the Oracle RAC nodes fenced themselves. Oracle is configured to use multipath and the SAN maintenance was performed on one half of the SAN filer head at a time, so there should have always been an available path to storage. Why did access to storage fail?

Environment

  • Red Hat Enterprise Linux 5
  • device-mapper-multipath
  • SAN storage

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