[Dovecot] Very High Load on Dovecot 2 and Errors in mail.err.

[Timo Sirainen]

On Wed, 2012-05-16 at 08:59 +0200, Urban Loesch wrote:

> The Server was running about 1 year without any problems. 15Min Load was between 0,5 and max 8.
> No high IOWAIT. CPU Idletime about 98%.
..
> #  iostat -k
> Linux 3.0.28-vs2.3.2.3-rol-em64t (mailstore4) 	16.05.2012 	_x86_64_	(24 CPU)

Did you change the kernel just before it broke? I'd try another version.