sudden performance drop - i/o related

[Aki Tuomi]

> On 11/05/2021 10:34 Marcin Gryszkalis <mg at fork.pl> wrote:
> 
>  
> On 11.05.2021 07:30, Aki Tuomi wrote:
> >> On 11/05/2021 01:07 Marcin Gryszkalis <mg at fork.pl> wrote:
> >> It looks like i/o risen from 150writes/s to 500writes/s (in top hours) -
> 
> > One thing that does come to mind is that you are delivering outside dovecot. Without knowing your system better, I would suggest that one thing to try would be to use dovecot-lda to deliver mail.
> exim delivers locally via /usr/local/libexec/dovecot/dovecot-lda and 
> it's the only way used for delivery (not counting occasional restoring 
> mail from backups)
> 
> > Are your users directly accessing the maildir?
> Not sure what you mean, they use imap (plus few dovecot/pop3 boxes for 
> automated processing).
> 
> best regards
> -- 
> Marcin Gryszkalis, PGP 0xA5DBEEC7 http://fork.pl/gpg.txt

Your logs indicate though that dovecot is finding new mails that were not indexed before. So something external must be placing them there.

Aki