On Mon, 2011-06-20 at 15:16 +0200, Denny Schierz wrote:
we have 2.0.13 running and most works well, but today we had some minor problems: The IMAP login process takes sometimes to much time. Over webmail (Roundcube 0.5.0.3) login wasn't sometimes possible, the normal clients hasn't any problems, until they login.
We had only ~ 20-30 active accounts, but 50-60 sessions. The most are Apple products (Ip*/Mac/. ..)because they have 4 sessions or more open.
Also we had ~212 processes with:
dovenull 2065 4364 0 14:50:32 ? 0:00 dovecot/imap-login vmail 2403 4364 0 14:58:31 ? 0:00 dovecot/imap
I suppose that means you had 100 IMAP clients simultaneously connected using SSL, which used up all imap-login processes with default settings. There should have been a warning logged about it though.
Switch to high performance login process mode (http://wiki2.dovecot.org/LoginProcess) or increase service imap-login { process_limit }.