[Ocfs2-users] Significant Slowdown when writing and deleting files at the same time

[Sunil Mushran]

Are you mounting -o writeback?


On Fri, Mar 29, 2013 at 12:28 PM, Andy <aryan1 at allantgroup.com> wrote:

> I have been having performance issues from time to time on our
> production ocfs2 volumes, so I set up a test system to try to reproduce
> what I was seeing on the production systems.  This is what I found out:
>
> I have a 2 node test system sharing a 2TB volume with a journal size of
> 256MB.  I can easily trigger the slowdown by starting to processes to
> write a 10GB file each, then I delete a different large file (7GB+)
> while the other processes are writing.  The slowdown is significant and
> very disruptive.  Not only did it take over 3 minutes to delete the
> file, every else with pause when entering that directory too.  A du
> command with stop and nfs access to that file system will think the
> server is not responding.  Under heavier amounts of writes, I have had a
> delete takes 13mins for a 8GB file, and NFS mounts return I/O errors.
> We often deal with large files, so this situation above is fairly common.
>
> I would like any ideas that would provide smoother performance of the
> OCFS2 volume and somehow eliminate the long pauses during deletes.
>
> Thanks,
>
> Andy
>
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