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List: ocfs2-users
Subject: Re: [Ocfs2-users] Ocfs2 slowdowns, high amount of reads during writes
From: Herbert van den Bergh <herbert.van.den.bergh () oracle ! com>
Date: 2013-04-12 18:17:37
Message-ID: 51684FC1.8010105 () oracle ! com
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One thing that comes to mind is partition alignment. Have you made sure
that the partition starts at a filesystem block size boundary? Check
with fdisk -lu
Thanks,
Herbert.
On 4/12/13 8:43 AM, Andy wrote:
> I previously wrote about slowdowns during writing and deleting files at
> the same time on an OCFS2 volume. I've tried writeback, and it still
> slows down a lot.
>
> I have also been doing some testings on a 2TB ocfs2 volume on a SSD. I
> was wondering how much better it would perform on an SSD. Unfortunately,
> I have run into an issue on the SSD, where ocfs2 ends up doing a whole
> ton of reads from the volume, and never gets much of a chance to write.
> This happens when I access the volume from 2 systems at the same time.
> My test scripts just use dd to write various sized files to various
> directories. Why would ocfs2 start doing a whole bunch of reads?
>
> Thanks,
>
> Andy
>
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