[Dovecot] nfs locking issues...

[John Gray]

Just for the record, I took Timo's suggestion, and went to just using 
dotlocks.  The problem hasn't return (at least not yet).

John

John Gray wrote:
> 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
>>   
>


-- 
John Gray                           gray at agora-net.com
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