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 manydovecot processes use all the available IO on a server. According toiotop the worst offenders seem to be in this state (NOTE: I swapped inphony username & IP info):
dovecot/imap [someusername 123.456.789.012 UID SEARCH]
The server in question is running with Maildirs on top of an XFSfilesystem. Is there anything I can do to optimize "UID SEARCH" or findout why it's being a problem? I've readhttps://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 aretaking many seconds... which causes thunderbird to timeout when doingthings like appending messages to user "Sent" mailboxes.
Any ideas?
Thanks,Ben Burke
Are you using FTS? If not, you should. See https://wiki.dovecot.org/Plugins/FTS
--- Aki Tuomi