Ocfs2 1.8 / Uek2: A mount point can hang when trying to access file in parallel direct i/o (Doc ID 1582699.1)

Last updated on SEPTEMBER 23, 2013

Applies to:

Linux OS - Version Oracle Linux 6.1 with Unbreakable Enterprise Kernel [2.6.39] and later
Information in this document applies to any platform.

Symptoms

Many processes try to open the same datafile simultaneously, and they hang for many minutes. The hangs on an open64() call.

Issue is sporadic, but always involves competing to open the same file simultaneously, but during each incident, it's not always the same file number.

The issue tends to occur around the busiest time of day. 

Cause

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