[Linux-cluster] Re: problems with 8 node production gfs cluster

[German Staltari]

David Teigland wrote:
> On Mon, Apr 17, 2006 at 05:41:39PM +0200, Nemanja Miletic wrote:
>   
>> Hi,
>>
>> Does anyone think that turning on journaling on files could help us
>> speed up the access to gfs partition?
>>
>> This would be difficult because journaling can be turned on only on
>> files that are empty. We have a large number of empty files of active
>> users that download all their mail from pop3 server, so turning on
>> jurnaling for them should be possible. 
>>     
>
> Data journaling might help, it will speed up fsync(), but will increase
> the i/o going to your storage.
>
>   
>> What size should be the journals when file journaling is on?
>>     
>
> Continue to use the default.
>
> Another thing you might try is disabling the drop-locks callback, allowing
> GFS to cache more locks.  Do this before you mount:
>   echo "0" >> /proc/cluster/lock_dlm/drop_count
>
>   
Did you apply this changes? Could you share the results of this changes 
in your configuration? Do you recommend it?
Thanks
German Staltari