Logs shows mmfs: [W] Kernel I/O hang persists on LUN xx: read sector xxxxx length xx pending xx seconds
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
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.