Hi @all,
I've created a Distributed-Replicated Volume consisting of 4 bricks on
2 servers.
# gluster volume create glusterfs replica 2 transport tcp \
gluster0{0..1}:/srv/gluster/exp0 gluster0{0..1}:/srv/gluster/exp1
Now I have the following very nice replication schema:
+-------------+ +-------------+
| gluster00 | | gluster01 |
+-------------+ +-------------+
| exp0 | exp1 | | exp0 | exp1 |
+------+------+ +------+------+
| | | |
+------+----------+ |
| |
+-----------------+
If one HD goes down, I'm backed! I'm even backed if one server goes down!
Great! But how will it be if I just add another Server with two bricks and
rebalance?
# gluster volume add-brick glusterfs gluster02:/srv/gluster/exp{0..1}
# gluster volume rebalance glusterfs start
The replication schema I obviously want is this:
+-------------+ +-------------+ +-------------+
| gluster00 | | gluster01 | | gluster02 |
+-------------+ +-------------+ +-------------+
| exp0 | exp1 | | exp0 | exp1 | | exp0 | exp1 |
+------+------+ +------+------+ +------+------+
| | | | | |
| +----------+ +----------+ |
| |
+------------------------------------------+
But I think I'll maybe get this one:
+-------------+ +-------------+ +-------------+
| gluster00 | | gluster01 | | gluster02 |
+-------------+ +-------------+ +-------------+
| exp0 | exp1 | | exp0 | exp1 | | exp0 | exp1 |
+------+------+ +------+------+ +------+------+
| | | | | |
+------+----------+ | +-----+
| |
+-----------------+
So how can I get the schema I want? Is this even possible? The examples
in the official 'Admin Guide' are quite trivial and don't cover this
scenario.
Cheers, Markus
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