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Re: suddenly slow writes on XFS Filesystem

To: stan@xxxxxxxxxxxxxxxxx
Subject: Re: suddenly slow writes on XFS Filesystem
From: Stefan Priebe <s.priebe@xxxxxxxxxxxx>
Date: Sun, 06 May 2012 21:25:10 +0200
Cc: Martin Steigerwald <Martin@xxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4FA69CB0.8000008@xxxxxxxxxxxxxxxxx>
References: <4FA63DDA.9070707@xxxxxxxxxxxx> (sfid-20120506_121127_622020_FC89E0F4) <201205061233.58496.Martin@xxxxxxxxxxxx> <4FA69CB0.8000008@xxxxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
Am 06.05.2012 17:45, 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.

Thanks Stan that's it. After deleting 200GB-300GB it's running fine again.

What is the general recommandation of free space?

Greets Stefan

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