[Dovecot] enourmous amount of disc writes

[Rainer Sigl]

Hi Robert,
many thanks for your answer!
Yes I'm aware of the necessity to upgrade the complete system. Beside 
this I wanted to search for a quick solution. Upgrading the system 
entails many other things and is in my eyes not possible on the living 
system.
Regards
Rainer


Robert Schetterer wrote:
> Rainer Sigl schrieb:
>> Hi List,
>> on my mailserver (exim4, dovecot 1.0.0, postgresql, ubuntu dapper, about
>> 500 users) I record an enourmous amount of disc writes (up to 18000
>> blocks written each second) in the time where most of users are active.
>> This IO activity causes wait-states on the disc interface (RAID5) and
>> finally slows down my mailmachine. Is there a explanation for these disc
>> writes respectively is there a possibility to minimize this activity.
>> Stopping Dovecot on this machine causes stopping most of the disc activity.
>>
>> Regards
>> Rainer Sigl
>>
>>
> Hi Rainer first you should upgrade to the latest stable of the 1.x branch
> or better 1.1.x, also dapper is very old perhaps try hardy
> 
> then retest, i run 2000 users on suse with dovecot 1.0.15 and mysql
> on sata 3ware hardware raid 1 500 GB on ext3 without any problems
> 

-- 
-----------------
Rainer Sigl,                      | email: sigl at mpe.mpg.de
MPI f. extraterrestrische Physik, | phone: +49 (89) 30000-3557
Postfach 1312,                    | fax:   +49 (89) 30000-3569
D-85741 Garching, Germany         | web:   http://www.mpe.mpg.de/~sigl/
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