Latency Issues With CFQ I/O Scheduler Resulting In OCFS2 Node Evictions
(Doc ID 603310.1)
Last updated on APRIL 21, 2020
Applies to:Linux OS - Version 2.6.9-5 to 2.6.9-41
Oracle Cloud Infrastructure - Version N/A and later
*** 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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