[Gluster-users] Per-client prefered server?

Yannick Perret yannick.perret at liris.cnrs.fr
Thu Mar 3 13:53:09 UTC 2016

Le 03/03/2016 13:18, Krutika Dhananjay a écrit :
> What does "nearest" storage server mean? Are the clients residing in 
> the storage pool too? Or are they external to the cluster?
They are external.
Nearest means that they are in the same building, linked by the same 
switch. Machines in the other building are rooted via some more equipments.

> -Krutika
> ------------------------------------------------------------------------
>     *From: *"Yannick Perret" <yannick.perret at liris.cnrs.fr>
>     *To: *gluster-users at gluster.org
>     *Sent: *Thursday, March 3, 2016 5:38:33 PM
>     *Subject: *[Gluster-users] Per-client prefered server?
>     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?
>     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.
>     Thanks in advance for any help.
>     Regards,
>     --
>     Y.
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>     Gluster-users mailing list
>     Gluster-users at gluster.org
>     http://www.gluster.org/mailman/listinfo/gluster-users

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