Logs shows mmfs: [W] Kernel I/O hang persists on LUN xx: read sector xxxxx length xx pending xx seconds

Solution Unverified - Updated -

Issue

  • Performance issue is faced and logs shows below I/O hang messages
Feb 11 17:10:54  mmfs: [W] Kernel I/O hang persists on LUN_215d: read sector 1739398480 length 64 pending 27185 seconds
Feb 11 17:11:54  mmfs: [W] Kernel I/O hang persists on LUN_215d: read sector 1739398480 length 64 pending 27245 seconds
Feb 11 17:11:54  mmfs: [W] Kernel I/O hang persists on LUN_215d: read sector 1739398480 length 64 pending 27245 seconds
Feb 11 17:12:54  mmfs: [W] Kernel I/O hang persists on LUN_215d: read sector 1739398480 length 64 pending 27305 seconds
Feb 11 17:12:54  mmfs: [W] Kernel I/O hang persists on LUN_215d: read sector 1739398480 length 64 pending 27305 seconds
Feb 11 17:13:54  mmfs: [W] Kernel I/O hang persists on LUN_215d: read sector 1739398480 length 64 pending 27365 seconds

Environment

  • Red Hat Enterprise Linux
  • Third-party modules loaded:
    • mmfslinux
    • mmfs26

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