On 07/15/2015 10:54 PM, Scott Harvanek wrote:
Using the virt group which does-
cluster.quorum-type: auto
cluster.server-quorum-type: server
And from my understanding this means that quorum enforcement is
enabled, and that it's brick related so if I only have two bricks then
I cannot achieve 51% and split brain is likely even with a third node
in the pool. If I move to fixed 1, then the likelihood of splitbrain
is high.
In a replica 2 setup, if you set cluster.quorum-type to auto, you can
avoid split-brains in AFR. But the first brick must be up at all times.
-Ravi
So what do I do here, get a fourth node and do distributed
replicated? Trying to find the best performance option while
minimizing split brain potential and I'm stuck with 3.6 clients (
RHEV-H ) so the aforementioned arbiter is out, Replica 3 just seems to
be a pig on the client side due to the triple write.
--
Scott H.
Ravishankar N <mailto:[email protected]>
July 15, 2015 at 1:09 PM
On 07/15/2015 09:22 PM, Scott Harvanek wrote:
I saw Ravi mention something earlier about the new arbiter volumes
in 3.7
- Can you run a arbiter 3.7 server volume with 3.6 clients? Or does
this not work?
Unfortunately, no. This is because the logic for the feature is
mostly in the AFR translator which is loaded on the client process
(with some minor logic in the arbiter translator loaded on the brick
process). So both clients and servers need to be 3.7.
Quorum question -
- 3.6 server and clients, replica 2, however there's three+ servers
in the cluster ( gluster pool list ). If one of the replicas fail
is quorum maintained via the other servers in the cluster even
though they are not part of the volume?
That would depend on what type of quorum is enabled (client or server
side). Each type has a different impact. You can look for the meaning
of cluster.quorum-type, cluster.quorum-count (these are client side
quorum options, applicable only to replicate volumes) and
cluster.server-quorum-type, cluster.server-quorum-ratio (these are
server side quorum options; they are not specific to replicate
volumes) in 'gluster volume set help`.
HTH,
Ravi
Scott Harvanek <mailto:[email protected]>
July 15, 2015 at 11:52 AM
I saw Ravi mention something earlier about the new arbiter volumes in
3.7
- Can you run a arbiter 3.7 server volume with 3.6 clients? Or does
this not work?
Quorum question -
- 3.6 server and clients, replica 2, however there's three+ servers
in the cluster ( gluster pool list ). If one of the replicas fail is
quorum maintained via the other servers in the cluster even though
they are not part of the volume?
_______________________________________________
Gluster-users mailing list
[email protected]
http://www.gluster.org/mailman/listinfo/gluster-users
