[Gluster-users] Question about the number of nodes

[Kaleb KEITHLEY]

On 04/19/2016 07:55 AM, Kevin Lemonnier wrote:
> Hi,
> 
> As stated in another thread, we currently have a 3 nodes cluster with sharding enabled used for storing VM disks.
> I am migrating that to a new 3.7.11 cluster to hopefully fix the problems with had friday, but since those 3
> nodes are nearly full we'd like to expand.
> 
> We have 3 nodes with a replica 3. What would be better, go to 5 nodes and use a replica 2 (so "wasting" one node),
> or go to 6 nodes with still a replica 3 ? Seems like having 3 replicas is better for safety, but can someone confirm
> that whats important for quorum is the number of bricks in a replica set, not the number of nodes total ?
> Would hate to get into a split brain because we upgraded to an even number of node.

I believe you could set up a `2x2 replica 2` cluster and use the fifth
node as an arbiter node to prevent/minimize split brain.

--

Kaleb