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Re: Small files perform much faster on newly formatted fs?

To: xfs@xxxxxxxxxxx
Subject: Re: Small files perform much faster on newly formatted fs?
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 8 Jun 2011 15:47:33 +0200
Cc: Norbert Veber <nveber@xxxxxxxxxxxxxx>
In-reply-to: <20110608122638.GQ28625@xxxxxxxxxxxxxx>
Organization: it-management http://it-management.at
References: <20110607163742.GH28625@xxxxxxxxxxxxxx> <201106080911.11286@xxxxxx> <20110608122638.GQ28625@xxxxxxxxxxxxxx>
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On Mittwoch, 8. Juni 2011 Norbert Veber wrote:
> Yes its already mounted this way as I mentioned in my original
> message: /dev/mapper/vg0-shared on /shared type xfs
> (rw,noatime,sunit=128,swidth=256)

Oh, I did only look at the xfs_info output.
> Both filesystems are on the same MD raid 5 which consists of 3 1 tb
> WD Black hard drive.

The difference could be that your filesystem is very much aged, and the 
free space clustered around to new files get heavily fragmented. Did you 
run xfs_defrag often? How full is your filesystem?

Also the log has sunit=0 against 16, maybe there's the diff.
Are you on a newer kernel that supports delaylog? Then try that.

mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

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