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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: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Sun, 06 May 2012 10:45:52 -0500
Cc: xfs@xxxxxxxxxxx, Stefan Priebe <s.priebe@xxxxxxxxxxxx>
In-reply-to: <201205061233.58496.Martin@xxxxxxxxxxxx>
References: <4FA63DDA.9070707@xxxxxxxxxxxx> (sfid-20120506_121127_622020_FC89E0F4) <201205061233.58496.Martin@xxxxxxxxxxxx>
Reply-to: stan@xxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
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.


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