On 27 February 2019 03:27 Ben Burke via dovecot < dovecot@dovecot.org> wrote:

Hi,

I'm running dovecot 2.2.x and I'm having an issue where I see many

dovecot processes use all the available IO on a server. According to

iotop the worst offenders seem to be in this state (NOTE: I swapped in

phony username & IP info):

dovecot/imap [someusername 123.456.789.012 UID SEARCH]

The server in question is running with Maildirs on top of an XFS

filesystem. Is there anything I can do to optimize "UID SEARCH" or find

out why it's being a problem? I've read

https://wiki2.dovecot.org/PerformanceTuning and the linked pages.

By "being a problem" I mean iostat -xmt 1 /dev/diskdevice shows 100%

utilization for long periods and in some cases io service times are

taking many seconds... which causes thunderbird to timeout when doing

things like appending messages to user "Sent" mailboxes.

Any ideas?

Thanks,

Ben Burke

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Aki Tuomi