[Gluster-users] Performance for KVM images (qcow)

[Robert Hajime Lanning]

On 04/09/13 03:13, Robert Hajime Lanning wrote:
> On 04/09/13 01:17, Eyal Marantenboim wrote:
>> Hi Bryan,
>>
>> We have 1G nics on all our servers.
>> Do you think that changing our design to distribute-replicate will
>> improve the performance?
>>
>> Anything in the gluster performance settings that you think I should
>> change?
>
> With GlusterFS, almost all the processing is in the client side.  This
> includes replication.  So, when you have "replica 4", the client will be
> duplicating all transactions 4 times, synchronously.  Your 1G ethernet
> just became 256M.
>
> I don't know how much "in production" your environment is.  You might
> want to try the 3.4 beta with the qemu glusterfs driver (using
> libgfapi.so).
>
> You should get a good speed bump, by bypassing the FUSE interface.
>
> Also look into the write-behind and read caching translators for the
> volume itself.
>

I forgot to pass along this article:
http://www.gluster.org/2012/11/integration-with-kvmqemu/

-- 
Mr. Flibble
King of the Potato People