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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.
--
Y.
-Krutika
From:
"Yannick Perret" <yannick.perret@xxxxxxxxxxxxx>
To: gluster-users@xxxxxxxxxxx
Sent: Thursday, March 3, 2016 5:38:33 PM
Subject: 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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