[Gluster-users] 2 nodes replication upgrade to 4 nodes

[Ran]

We are building a storage that will start as 2 servers in replica mode,
I was just wondering if its possible to add another replica set to that
volume later and by that make it distributed?
let say we have server1 & server2 as replica set 1 by running:
gluster volume create test-volume replica 2 transport tcp server1:/exp1
server2:/exp2
then later on will need to add server3 & server4 as replica set2, so i
guess my questune is if at this point we run:
gluster peer probe server3
gluster peer probe server4
gluster volume add-brick test-volume server3:/exp3 server4:/exp4

Will also be great if someone here have any expirience with ext4 filesystem
in production.

Ronald,
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