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Re: suddenly slow writes on XFS Filesystem

To: xfs@xxxxxxxxxxx, stan@xxxxxxxxxxxxxxxxx
Subject: Re: suddenly slow writes on XFS Filesystem
From: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Date: Mon, 7 May 2012 21:08:14 +0200
Cc: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx>
In-reply-to: <4FA7FA14.6080700@xxxxxxxxxxxxxxxxx>
References: <4FA63DDA.9070707@xxxxxxxxxxxx> <4FA77842.5010703@xxxxxxxxxxxx> <4FA7FA14.6080700@xxxxxxxxxxxxxxxxx> (sfid-20120507_185142_476909_3A22D91B)
User-agent: KMail/1.13.7 (Linux/3.3.0-trunk-amd64; KDE/4.7.4; x86_64; ; )
Am Montag, 7. Mai 2012 schrieb Stan Hoeppner:
> What I would suggest is doing an xfsdump to a filesystem on another LUN
> or machine, expand the size of this LUN by 50% or more (I gather this
> is an external RAID), format it appropriately, then xfsrestore.  This
> will eliminate your current free space fragmentation, and the 50% size
> increase will delay the next occurrence of this problem.  If you can't
> expand the LUN, simply do the xfsdump/format/xfsrestore, which will
> give you contiguous free space.

Maybe the new dm thin provisioning could help here? But it might just move 
the fragmentation from the filesystem to the device mapper layer. I did not 
yet check the implementation details of the new thin provisioning target.

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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