Gluster users - Dec 2011 - Speed of glusterfs

Hi,

we're currently testing glusterfs but getting a real slow connection with
it.

I setup a environment with 2 replicated storage servers. Both machines and the 
client are connected by 1 Gbit, but if I copy a 2.5 GB file from the client to 
the volumen mounted with glusterfs protocol, I never get more than 35-40 MB/sec.

On the two storage I also run a NFS server. If I copy the same file from the 
client to one storage by NFS (the NFS server that was shipped with RHEL6), I 
get never less than 90-95 MB/sec. So the network/HDDs are possible to provide 
faster transfer.

Is there a change to get glusterfs to about the same speed? And why is it so 
slow? Does the glusterfs send the data directly to both storages? This would 
explain why it is so slow. But is there a change then to send the data just to 
one server and this one replicates it (over a second NIC) to the second one)?


Regards,
Marc

Hi Marc,

The GlusterFS client DOES send the data directly to both storage, that's
why your speed is about half the NFS speed.
Concerning tweaks to write only on one server, and then replicate from one
server to another, I think it's not possible given the architecture of
GlusterFS.
If someone know more details, even tweaks about this... I would be very
interested.

Regards,

Rapha?l.

2011/12/14 Marc Muehlfeld <Marc.Muehlfeld at medizinische-genetik.de>
> Hi,
>
> we're currently testing glusterfs but getting a real slow connection
with
> it.
>
> I setup a environment with 2 replicated storage servers. Both machines and
> the client are connected by 1 Gbit, but if I copy a 2.5 GB file from the
> client to the volumen mounted with glusterfs protocol, I never get more
> than 35-40 MB/sec.
>
> On the two storage I also run a NFS server. If I copy the same file from
> the client to one storage by NFS (the NFS server that was shipped with
> RHEL6), I get never less than 90-95 MB/sec. So the network/HDDs are
> possible to provide faster transfer.
>
> Is there a change to get glusterfs to about the same speed? And why is it
> so slow? Does the glusterfs send the data directly to both storages? This
> would explain why it is so slow. But is there a change then to send the
> data just to one server and this one replicates it (over a second NIC) to
> the second one)?
>
>
> Regards,
> Marc
>
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