Why fileystem went to read-only mode after storage controller failure when system and storage have redundant connectivity?

Solution Unverified - Updated -

Issue

  • filesystem went to read-only mode due to one of the storage controller failure.
  • storage have multiple controller and LUN connected to system with 4 paths. 2 path from each controller.
  • Issue happened on one system only, other systems connected to the same storage doesn't affected this issue.

Environment

  • Red Hat Enterprise Linux (RHEL) 6.2
  • ext3, ext4

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