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Re: Improving XFS file system inode performance

To: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Subject: Re: Improving XFS file system inode performance
From: Jesse Stroik <jstroik@xxxxxxxxxxxxx>
Date: Mon, 22 Nov 2010 16:32:06 -0600
Cc: Linux XFS <xfs@xxxxxxxxxxx>
In-reply-to: <20101122232528.21b78a9e@xxxxxxxxxxxxxx>
References: <4CEAE7D7.6050401@xxxxxxxxxxxxx> <20101122232528.21b78a9e@xxxxxxxxxxxxxx>
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On 11/22/2010 04:25 PM, Emmanuel Florac wrote:
Le Mon, 22 Nov 2010 15:59:51 -0600 vous écriviez:

Performance was fine before the file system was filled -- last week
~8TB showed up and filled the 20TB file system.  Since, it has been
performing poorly.

Maybe it got fragmented? How does fragmentation look like?

I wasn't able to resolve this in reasonable time. Part of the issue is that we're dealing with files within about 100k directories. I'll attempt to get the fragmentation numbers overnight.

I suspect the regularly listed set of files on this fs exceeds the inode cache. Where can I determine the cache misses and tune the file system?


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