[Dovecot] enourmous amount of disc writes
sigl at mpe.mpg.de
Mon Jun 15 17:24:40 EEST 2009
many thanks for you answer.
yes, this solution did we discuss as well. For a future testing system I
will try this. But I can't use it on the living system in the moment.
Richard Hobbs wrote:
> You might also want to enable "noatime" in the mount options for the
> volume housing the data... if you're using maildir, this *could* reduce
> the number of writes by half, theoretically!
> 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.
>>> 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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