[Dovecot] Dovecot 1.0-rc15 on Solaris 10

[Steven F Siirila]

We are running Dovecot 1.0-rc15 on Solaris 10 and are starting to ramp up
our user count and ran into a file descriptor limit:

Jan  1 19:38:54 <hostname> dovecot: IMAP(username): Newly created index file is corrupted: /home/username/.imap/foldername/dovecot.index.tmp
Jan  1 19:38:54 <hostname> dovecot: IMAP(username): file mail-index.c: line 1806 (mail_index_move_to_memory): assertion failed: (index->fd == -1)
Jan  1 19:38:54 <hostname> dovecot: pipe() failed: Too many open files
Jan  1 19:38:54 <hostname> dovecot: Temporary failure in creating login processes, slowing down for now

We got around this by calling "ulimit -n 512" and restarting Dovecot.
This got us further (upwards of 300 concurrent users), but we are now
running into what appears to be a full listen queue (connections are
not rejected, but rather slow in being established).

What I would like to know is if anyone else out there runs with large numbers
of concurrent IMAP sessions via Dovecot and has run into problems.
If so, did you have to up your fd limit w/ulimit?  Any other issues?

-- 

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