[Dovecot] Maildir Synchronization warnings

[Timo Sirainen]

On Fri, 2013-08-02 at 15:34 +0800, Kavish Karkera wrote:
> Hi,
> 
> We are repeatedly getting these below warnings for some of our users, al though we have no complaints from them yet,
>  we need to know why these warning occurs.
> 
> So it would be help full if some one explain these warning msg in detail.
..
> Aug  2 12:52:55 blade8 dovecot: imap(kavish.karkera at example.com): Warning: Maildir: Scanning /mail/v3store/example.com/kavish.karkera at example.com/Maildir/cur took 94 seconds (23191 readdir()s, 0 rename()s to cur/, why=0x1)

It means that the maildir INBOX is huge, and it takes a long time to
access them with your available disk IO. Possibilities:

a) Move move of your mails away from INBOX.

b) Switch to different mailbox format that can handle large mailboxes,
such as mdbox or sdbox.