[Gluster-users] Per-client prefered server?

Saravanakumar Arumugam sarumuga at redhat.com
Thu Mar 3 14:17:18 UTC 2016

On 03/03/2016 05:38 PM, Yannick Perret wrote:
> Hello,
> I can't find if it is possible to set a prefered server on a 
> per-client basis for replica volumes, so I ask the question here.
> The context: we have 2 storage servers, each in one building. We also 
> have several virtual machines on each building, and they can migrate 
> from one building to an other (depending on load, maintenance…).
> So (for testing at this time) I setup a x2 replica volume, one replica 
> on each storage server of course. As most of our volumes are "many 
> reads - few writes" it would be better for bandwidth that each client 
> uses the "nearest" storage server (local building switch) - for 
> reading, of course. The 2 buildings have a good netlink but we prefer 
> to minimize - when not needed - data transferts beetween them (this 
> link is shared).
> Can you see a solution for this kind of tuning? As far as I understand 
> geo-replica is not really what I need, no?

Yes, geo-replication "cannot" be used as you wish to carry out "write" 
operation on Slave side.

> It exists "cluster.read-subvolume" option of course but we can have 
> clients on both building so a per-volume option is not what we need. 
> An per-client equivalent of this option should be nice.
> I tested by myself a small patch to perform this - and it seems to 
> work fine as far as I can see - but 1. before continuing in this way I 
> would first check if it exists an other way and 2. I'm not familiar 
> with the whole code so I'm not sure that my tests are in the 
> "state-of-the-art" for glusterfs.
maybe you should share that interesting patch :) and get better feedback 
about your test case.

> Thanks in advance for any help.
> Regards,
> -- 
> Y.
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