On 15 Jul 2019, at 23.17, Ralf Hildebrandt via dovecot <[email protected]> wrote: > > * Ralf Hildebrandt via dovecot <[email protected]>: >> We're using dovecot (via LMTP) as a backup for all incoming mail. >> >> I upgraded from 2.3.6 to 2.3.7 on the 12th: >> 2019-07-12 14:35:44 upgrade dovecot-imapd:amd64 2:2.3.6-2~bionic >> 2:2.3.7-8~bionic >> >> and it seems that 2.3.7 is slower than 2.3.6 -- mail to the backup >> IMAP box is suddenly taking quite some time to get delivered and is piling up >> in the queue. > > And alas, I had a look at the monitoring and found that disk IO has > increase A LOT after the update: > https://www.arschkrebs.de/images/dovecot-disk-io-increase.png > > I zoomed in and found that the sudden increace in IO coincides with > the update to 2.3.7 (14:35): > https://www.arschkrebs.de/images/dovecot-io-2.png > <https://www.arschkrebs.de/images/dovecot-io-2.png>
Do the different disks have different kinds of data? Like you seem to be using external attachments and fts? Also your doveconf -n doesn't show what fts backend you're using. Or is it just half-configured and not really used?
