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XFS unlink still slow on 3.1.9 kernel ?

To: xfs@xxxxxxxxxxx
Subject: XFS unlink still slow on 3.1.9 kernel ?
From: Richard Ems <richard.ems@xxxxxxxxxxxxxxxxx>
Date: Mon, 13 Feb 2012 17:57:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120129 Thunderbird/10.0.1
Hello list !

I ran a "find dir" on one directory with 11 million files and dirs in it
and it took 100 minutes. Is this a "normal" run time to be expected?

I am running openSUSE 12.1, kernel 3.1.9-1.4-default. The 20 TB XFS
partition is 100% full and is on an external InforTrend RAID system with
24 x 1 TB SATA HDDs on RAID 6 with one hot-spare HDD, so 21 data discs
plus 2 parity discs plus 1 hot-spare disc. The case is connected through
SCSI.

The system was not running anything else on that discs and the load on
the server was around 1 because of only this one find command running.

I am asking because I am seeing very long times while removing big
directory trees. I thought on kernels above 3.0 removing dirs and files
had improved a lot, but I don't see that improvement.

This is a backup system running dirvish, so most files in the dirs I am
removing are hard links. Almost all of the files do have ACLs set.


# mount | grep xfs
/dev/sda1 on /backup/IFT type xfs
(rw,noatime,nodiratime,attr2,delaylog,nobarrier,logbufs=8,logbsize=256k,sunit=256,swidth=5376,noquota,_netdev)

Any thoughts?


Thanks, Richard



-- 
Richard Ems       mail: Richard.Ems@xxxxxxxxxxxxxxxxx

Cape Horn Engineering S.L.
C/ Dr. J.J. Dómine 1, 5º piso
46011 Valencia
Tel : +34 96 3242923 / Fax 924
http://www.cape-horn-eng.com

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