[Dovecot] Dovecot 1.2.9 Crash, NFS

[Timo Sirainen]

On 26.3.2012, at 18.25, Müller Lukas wrote:

> Thanks for the quick answer.
> 
> I realised, that the error didn't occur since quite a while, opposed to what our client suggested.
> Back then I activated the two workarounds (imap_client_workarounds = outlook-idle delay-newmail) and increased mail_max_userip_connections for IMAP.
> 
> Is it possible that those could have improved the situation?

Unlikely.

>>> Mar  6 08:26:31 mail02 dovecot: IMAP(user at example.com): fdatasync(/data/vmail/example.com/user/dovecot-uidlist) failed: Input/output error
>>> Mar  6 08:42:29 mail02 dovecot: IMAP(user at example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1522, file=1326961561.V15I4d8562M567017.mail02:2,Sad)
>>> Mar  6 08:42:29 mail02 dovecot: IMAP(user at example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1523, file=1326705103.V15I90105M613353.mail01:2,Sad)
>>> Mar  6 08:42:29 mail02 dovecot: IMAP(user at example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 4: 1326961561.V15I4d8562M567017.mail02:2,Sad (uid 1522 -> 1598)
> ..
> 
>>> My suspicion/speculation what happens is the following:
>>> Multiple users are accessing the Mailbox from their offices (all on the same server), one (or more) uses the Webmail or accesses the Mailbox from a different IP.
>>> Somehow this leads to problems with Locks on NFS, which leads to the crash.
> 
>> Yes, most likely this is what's happening. Although your errors are more severe than what normally happens. I guess your NFS server is also partially to blame (microsecond resolution timestamps are at least helpful).
> 
> I had a quick look a tour NFS (NetApp), but didn't find anything useful.
> In case the problem persists, I will check with the coworker responsible for NetApp.

I guess you just had very bad luck. NetApp has a good NFS implementation and normally works fine with Dovecot.