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Re: suddenly slow writes on XFS Filesystem

To: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Subject: Re: suddenly slow writes on XFS Filesystem
From: Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx>
Date: Mon, 07 May 2012 08:40:41 +0200
Cc: stan@xxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <201205062343.21871.Martin@xxxxxxxxxxxx>
References: <4FA63DDA.9070707@xxxxxxxxxxxx> <201205061233.58496.Martin@xxxxxxxxxxxx> <4FA69CB0.8000008@xxxxxxxxxxxxxxxxx> (sfid-20120506_233742_387085_AFEABC59) (sfid-20120506_233742_387085_AFEABC59) <201205062343.21871.Martin@xxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20120313 Thunderbird/3.1.20
Am 06.05.2012 23:43, schrieb Martin Steigerwald:
> 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?
It is a HW Adaptec 5805 Controller with 20x 7200rpm SATA Disks.

> Can free space be defragmented in XFS? xfs_fsr only tries to defragment 
> files as far as I know.
That is a good question.


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