[Dovecot] Lot of dovecot process writes

Robert Schetterer rs at sys4.de
Wed Mar 6 14:54:50 EET 2013

Am 06.03.2013 13:44, schrieb Angel L. Mateo:
> El 06/03/13 13:22, Robert Schetterer escribió:
>> Am 06.03.2013 13:15, schrieb Angel L. Mateo:
>>> Hello,
>>>      While monitoring my servers' behaviour (ubuntu 12.04 with dovecot
>>> 2.1.9, with about 70000 users) I have found that lots of disk usage is
>>> done by dovecot process (the parent process). Since lmtp, imap and pop3
>>> connections are handle by their own process, what could be the reason of
>>> this?
>> maildir may no be optimal for such high amount of users, use i.e mdbox
>> http://wiki2.dovecot.org/MailboxFormat/dbox
>     I know this. We are planning to migrate to dbox, but in a
> multiserver environment like ours is not so trivial because of indexes
> (we tried it with indexes in nfs storage but performance was poor).

yes ,migrations on big systems, are always difficult

>     In any case, I don't understand why dovecot parent process has these
> huge amount of IO, since, I guess, IO should be done by user's processes
> (lmtp, imap or pop), not dovecot parent.
>     My only hypothesis is related with log messages,
 but then IO should
> be done by rsyslog process, not dovecot, shouldn't it?

dont think that this has impact, what about upgrading to recent version
first, dont speculate, do real analysis

after all with such amount of users , you might want to use

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for optimizing your setup.


Best Regards
MfG Robert Schetterer

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