From: Dave Chinner <david@fromorbit.com>
To: Stefan Priebe <s.priebe@profihost.ag>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: suddenly slow writes on XFS Filesystem
Date: Mon, 7 May 2012 11:34:56 +1000 [thread overview]
Message-ID: <20120507013456.GW5091@dastard> (raw)
In-Reply-To: <4FA63DDA.9070707@profihost.ag>
On Sun, May 06, 2012 at 11:01:14AM +0200, Stefan Priebe wrote:
> 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.
What sort of random IO? size, read, write, direct or buffered, data
or metadata, etc? iostat -x -d -m 5 and vmstat 5 traces would be
useful to see if it is your array that is slow.....
> 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
Your filesystem is near full - the allocation algorithms definitely
slow down as you approach ENOSPC, and IO efficiency goes to hell
because of a lack of contiguous free space to allocate from.
> #~ df -i
> /dev/sdb1 4875737052 4659318044 216419008 96% /mnt
You have 4.6 *billion* inodes in your filesystem?
> Any ideas?
None until I understand your workload....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2012-05-07 1:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-06 9:01 suddenly slow writes on XFS Filesystem Stefan Priebe
2012-05-06 10:31 ` Martin Steigerwald
2012-05-06 10:33 ` Martin Steigerwald
2012-05-06 15:45 ` Stan Hoeppner
2012-05-06 19:25 ` Stefan Priebe
2012-05-07 1:39 ` Dave Chinner
2012-05-06 21:43 ` Martin Steigerwald
2012-05-07 6:40 ` Stefan Priebe - Profihost AG
2012-05-07 1:34 ` Dave Chinner [this message]
2012-05-07 6:39 ` Stefan Priebe - Profihost AG
2012-05-07 7:17 ` Dave Chinner
2012-05-07 7:22 ` Stefan Priebe - Profihost AG
2012-05-07 16:36 ` Stan Hoeppner
2012-05-07 19:08 ` Martin Steigerwald
2012-05-07 20:05 ` Stefan Priebe
2012-05-09 6:57 ` Stan Hoeppner
2012-05-09 7:04 ` Dave Chinner
2012-05-09 7:36 ` Stefan Priebe - Profihost AG
2012-05-09 7:49 ` Stan Hoeppner
2013-02-15 15:06 ` 32bit apps and inode64 Stefan Priebe - Profihost AG
2013-02-15 21:46 ` Ben Myers
2013-02-16 10:24 ` Stefan Priebe - Profihost AG
2013-02-17 21:33 ` Dave Chinner
2013-02-18 8:12 ` Stefan Priebe - Profihost AG
2013-02-18 22:06 ` Dave Chinner
2013-02-17 8:13 ` Jeff Liu
2013-02-19 19:11 ` Ben Myers
2012-05-07 23:42 ` suddenly slow writes on XFS Filesystem Dave Chinner
2012-05-07 8:21 ` Martin Steigerwald
2012-05-07 16:44 ` Stan Hoeppner
2012-05-07 8:31 ` Martin Steigerwald
2012-05-07 13:57 ` Stefan Priebe - Profihost AG
2012-05-07 14:32 ` Martin Steigerwald
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