Replicas are defined in the order bricks are listed in the volume create
command. So gluster volume create myvol replica 2 server1:/data/brick1
server2:/data/brick1 server3:/data/brick1 server4:/data/brick1 will
replicate between server1 and server2 and replicate between server3 and
server4.
See also
https://joejulian.name/blog/how-to-expand-glusterfs-replicated-clusters-by-one-server/
On 11/08/2016 03:28 PM, Lopez, Dan-Joe wrote:
Hello All,
I’d like to automate a gluster replica cluster in a
way that allows me to later add single servers on the fly. I can’t
seem to understand from the docs how I might achieve this. It seems
logical that a replica cluster needs to have at least 2 servers
initially, but thereafter, I see no reason that I shouldn’t be able to
add a single server to the cluster. From what I have read, it seems
that the number of servers I add in the future needs to match the
number of servers that I started with.
e.g. replica 1 doesn’t really make sense, and isn’t allowed, but if I
start with replica n; I must always add n servers at a time to the
volume, I can’t just add one server to have an n+1 replica…
If anyone could point me in the right direction here, I’d really
appreciate it.
Dan-Joe Lopez
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