dovecot - Apr 2012 - Dovecot 1.2.9. next_uid was lowered

Hi There

A while ago I posted here about a crash of dovecot, that had to do with nfs and
was quite certainly due to bad luck.

But still one problem persists:
We have a Mailbox, that is accessed from multiple users using IMAP.
Occasionally all the Emails in the mailbox seem to be missing, when accessing
the Mailbox through IMAP, although they're still there on the server.

This seems to happen, if the users are accessing the Mailbox on Server1 and at
the same time an email gets delivered to the mailbox on server2.
Since it happens quite seldom, there must be other conditions or circumstances
that have to be met for the problem to occur. Unfortunately I don't know
which.

Shortly after the mail gets delivered on server2, I get the following errors on
server1:
mail01 dovecot: IMAP(akzidenz at triner.ch):
fdatasync(/data/vmail/example.com/user/dovecot-uidlist) failed: Input/output
error
mail01 dovecot: IMAP(akzidenz at triner.ch):
/data/vmail/example.com/user/dovecot-uidlist: next_uid was lowered (2143 ->
2142, hdr=2142)

The new mail is than missing in the uidlist and as long as no new mail arrives
all folders of the mailbox appear to be empty.
If a new mail arrives, it will get the uid that should have been given to the
pervious mail (the one that caused the error).
The previous mail still won't be listed in the uidlist, but everything works
as expected.
Best regards
Lukas M?ller
Systems Engineer
_______________________________________________
NEWMEDIA
S?dostschweiz Newmedia AG

http://www.newmedia.ch<http://www.newmedia.ch/>
_______________________________________________

TYPO3 & Drupal - Wir wissen wie.
Ihre professionelle Web Agentur
in Chur, Ilanz, Glarus und Z?rich.

I'll just say what I'm sure someone else will shortly :)

The problem is NFS: http://wiki2.dovecot.org/NFS
The solution is 2.x Director: http://wiki2.dovecot.org/Director

Although it looks like you're currently on 1.x so it'd be a fairly
significant upgrade for you.


On Tue, Apr 3, 2012 at 3:24 PM, M?ller Lukas <lukas.mueller at
newmedia.ch>wrote:
> Shortly after the mail gets delivered on server2, I get the following
> errors on server1:
> mail01 dovecot: IMAP(akzidenz at triner.ch): fdatasync(/data/vmail/
> example.com/user/dovecot-uidlist) failed: Input/output error
> mail01 dovecot: IMAP(akzidenz at triner.ch): /data/vmail/
> example.com/user/dovecot-uidlist: next_uid was lowered (2143 -> 2142,
> hdr=2142)
>
>