Re: [PLUG] XFS on CentOS-5.9

On Wed, Jun 12, 2013 at 5:40 PM, JP Vossen <jp@jpsdomain.org> wrote:

Short version: what, if anything, is going to bit me for using a 26TB XFS filesystem on CentOS-5.9?

Hi JP,

I have 2 ~30TB XFS filesystems on RHEL5. I've been very impressed, but I did come across one weird problem.

Apparently the achilles heel of XFS is lots of small files.

One of my XFS instances supports a job that creates tons of short log files. I've run into the condition where there are not enough of the right kind of extents and I end up not being able to write anything to the filesystem.

The way to prevent this is to periodically clean up poorly allocated extents with "xfs_fsr". You can run it from cron. The catch is it can't run it if you are in the problem condition. In this case, you have to manually move a bunch of files to a different filesystem and then move them back.

Austin

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