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suddenly slow writes on XFS Filesystem

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: suddenly slow writes on XFS Filesystem
From: Stefan Priebe <s.priebe@xxxxxxxxxxxx>
Date: Sun, 06 May 2012 11:01:14 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
Hi,

since a few days i've experienced a really slow fs on one of our backup systems.

I'm not sure whether this is XFS related or related to the Controller / Disks.

It is a raid 10 of 20 SATA Disks and i can only write to them with about 700kb/s while doing random i/o. I tried vanilla Kernel 3.0.30 and 3.3.4 - no difference. Writing to another partition on another xfs array works fine.

Details:
#~ df -h
/dev/sdb1             4,6T  4,4T  207G  96% /mnt

#~ df -i
/dev/sdb1            4875737052 4659318044 216419008  96% /mnt

#~ xfs_db -c frag -r /dev/sdb1
actual 83160469, ideal 82145389, fragmentation factor 1,22%

#~ xfs_info /dev/sdb1
meta-data=/dev/sdb1 isize=256 agcount=5, agsize=268435392 blks
         =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=1218967031, imaxpct=5
         =                       sunit=64     swidth=1280 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=32768, version=2
         =                       sectsz=512   sunit=64 blks, lazy-count=0
realtime =none                   extsz=4096   blocks=0, rtextents=0

#~ cat /proc/mounts
/dev/sdb1 /mnt xfs rw,noatime,nodiratime,attr2,nobarrier,logbufs=8,logbsize=256k,sunit=512,swidth=10240,prjquota 0 0

Any ideas?

Stefan

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