After presenting new paths and removing the old paths, all device-mapper-multipath paths fail on Red Hat Enterprise Linux

Solution Unverified - Updated -

Issue

  • We have migrated fabric storage ports from old ports to new ports and performed a scsi rescan, but the filesystems became read only.

Environment

  • Red Hat Enterprise Linux (RHEL) including
    • Red Hat Enterprise Linux 5 (RHEl5)
    • Red Hat Enterprise Linux 6 (RHEL6)
  • device-mapper-multipath to manage multiple paths to storage devices
  • SAN-based storage provided by a fabric switch
    • Switching paths to use different fabric switch ports, and removing the old paths through the old fabric switch ports.

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