suddenly slow writes on XFS Filesystem

[Martin Steigerwald]

Am Sonntag, 6. Mai 2012 schrieb Stefan Priebe:
> Hi,

Hi Stefan,

> 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. I tried vanilla Kernel 3.0.30
> and 3.3.4 - no difference. Writing to another partition on another xfs
> array works fine.

How do you measure the 700 KB/s?

Anything in dmesg?

I and likely others here would be interested in vmstat and iostat outputs 
during slowness.

See:

http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F

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