The cpu requirements are usually quite low for fsck, what your
most likely seeing is disk contention due to the amount of IO.
Personally I would recommend to consider moving to 8.2 + ZFS as
our filing system as it removes fsck from the equation, as well
as giving lots of other benefits.
Regards
Steve
----- Original Message -----
From: "Sergi Seira" <s.seira@cdmon.com>
To: <freebsd-stable@freebsd.org>
Sent: Tuesday, April 12, 2011 2:23 PM
Subject: background fsck high load on 8.1
> Hello,
>
> we've experienced that background fsck on 8.1 degrades server
performance on a higher degree than in previous fbsd versions
> (6.3, 7.3; amd64).
>
> We've noticed it after upgrading - same hardware - to a 8.1-RELEASE.
> Now, performance of other services (i.e. apache, mysql) during a background
fsck falls miserably.
>
> Is there any way to calm fsck down?, nice(1)?, some sysctl?
>
> We have also gmirror, but we prevent to rebuild it if there is a fsck
running in background.
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