[Dovecot] Resynchronization of indexes (or Warning: Maildir Scanning <dir> took <X> seconds)

[Timo Sirainen]

On 5.9.2012, at 14.40, Angel L. Mateo wrote:

> Sep  3 12:35:49 myotis32 dovecot: imap(<imapuser>): Warning: Maildir: Scanning <maildir cur directory> took 62 seconds (9516 readdir()s, 0 rename()s to cur/, why=0x80)
> 
> 	We have check that messages are directed with lmtp to the same server the user (scenario 3 at http://wiki2.dovecot.org/NFS with director in front of backend servers).
> 
> 	So my question is why is dovecot using these readdirs operations? why it is scanning the whole cur directory of the user? I guess this is an index resynchronization, but I don't know could it be the cause.

That's the way Maildir works. If Dovecot is the only one accessing the maildir, you can set maildir_very_dirty_syncs=yes to reduce how often readdir()s are done (but it doesn't completely eliminate them in all situations).