Latency Issues With CFQ I/O Scheduler Resulting In OCFS2 Node Evictions

(Doc ID 603310.1)

Last updated on JANUARY 17, 2018

Applies to:

Linux OS - Version 2.6.9-5 to 2.6.9-41
Linux x86-64
Linux x86
Linux x86-64

*** 2018-01-17 Reviewed For Currency ***


In some kernel versions, the default I/O scheduler CFQ (Completely Fair Queuing) has a known bug which can cause erratic system behavior, including a system reboot.  Often the first indication of this problem is that OCFS2 will fence the node because of disk heartbeat timeouts after a long I/O waits.


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