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From: Martin Steigerwald <Martin@lichtvoll.de>
To: stan@hardwarefreak.com
Cc: Stefan Priebe <s.priebe@profihost.ag>, xfs@oss.sgi.com
Subject: Re: suddenly slow writes on XFS Filesystem
Date: Sun, 6 May 2012 23:43:21 +0200	[thread overview]
Message-ID: <201205062343.21871.Martin@lichtvoll.de> (raw)
In-Reply-To: <4FA69CB0.8000008@hardwarefreak.com>

Am Sonntag, 6. Mai 2012 schrieb Stan Hoeppner:
> On 5/6/2012 5:33 AM, Martin Steigerwald wrote:
> > Am Sonntag, 6. Mai 2012 schrieb Stefan Priebe:
> >> 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.
> > 
> > Additionally what RAID is this? SoftRAID or some - which one? -
> > hardware RAID controller? And what disks are used, whats the rpm of
> > these?
> 
> I doubt much of this stuff matters.  Stefan's filesystem is 96% full,
> w/~200GB free.  This free space is likely heavily fragmented.  If he's
> doing allocation in this fragmented free space I'd think that would
> fully explain his write performance dropping off a cliff due to massive
> head seeking.

Hmmm, I thought about that low free space percentage, too, but then 200 GB 
free still sounded like quite much to me. Nonetheless, since according to 
Stefan freeing some space solved the slowness issue, that seems to have 
been it.

Can free space be defragmented in XFS? xfs_fsr only tries to defragment 
files as far as I know.

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

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  parent reply	other threads:[~2012-05-06 21:43 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 [this message]
2012-05-07  6:40       ` Stefan Priebe - Profihost AG
2012-05-07  1:34 ` Dave Chinner
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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