On Mon, 2010-01-25 at 13:16 +0000, Andrew Hearn wrote: > dovecot: Warning: chdir(/maildir/x.co.uk/users/y) blocked for 18 secs > This tends to last a minute or so for different users. > > /maildir is a NFS mount, and I'm suspecting it's the NFS server being > busy and dovecot having to wait.
Right. > Other than replacing the NFS server with faster hardware is there > anything else we can do? Nope. Although with v2.0 the warning is gone, it'll just silently wait for however long it needs to. But then it's the imap/pop3 process that waits, not a forked "dovecot" master process, which was causing confusion. Oh, and of course you could try to reduce disk I/O on the NFS server. If you've only a single Dovecot server, you can keep using mail_nfs_storage=no. Also you could try maildir_very_dirty_syncs=yes if you've nothing else besides Dovecot touching your maildirs.
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