[Dovecot] nfs locking issues...

[John Gray]

The locking issue is on the mbox files.  When it happens, I get a bunch 
procmail processes backing up waiting for the lock.

The filesystem is reiserfs (version 3).

The NFS server is debian sarge box (which will be going to etch this 
weekend).  And its using the nfs-kernel-server.

The dead locks appear to be the same nfs client machine.  Though I'm not 
dead sure on it.  The mail delivery does come in on several machines.  
And the imap/pop to just one for a given user.

I'm not seeing any lockd messages.  I'll look into making sure its running.

I'll try to get an strace if I see it again.  And I'll try the dotlock 
suggestion.

Thanks Timo and Aaron!

John

Timo Sirainen wrote:
> On Tue, 2008-02-26 at 11:03 -0500, John Gray wrote:
>   
>> I run into lock deadlocks if I run dovecot over nfs
>>     
>
> As Aaron asked, it would be useful to strace the process to see what
> exactly is waiting: mbox file or index files, dotlocking or fcntl
> locking.
>
>   
>> Sometimes I can kill all the processes, remove the dot locks, and 
>> recover.  Something I need to reboot the nfs server to recover.
>>     
>
> Maybe you could just try disabling fcntl locking for index files and see
> how it works then:
>
> lock_method = dotlock
>
> Also if that doesn't help, try how mboxes work with only dotlocking:
>
> mbox_read_locks = dotlock
> mbox_write_locks = dotlock
>