Hung tasks from unresponsive ALUA multipath storage

Solution Unverified - Updated -

Issue

  • System was rebooted from devices hanging trying to access multipath storage
  • I/O to an ALUA LUN was hung for several minutes
  • A system with Netapp storage in ALUA mode experienced hung tasks

Environment

  • Red Hat Enterprise Linux 6
  • device-mapper-multipath
  • multipath storage using ALUA standard

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