[ovirt-users] Hyperconverged Setup and Gluster healing

[Denis Chaplygin]

Hello!

On Mon, Apr 24, 2017 at 5:08 PM, FERNANDO FREDIANI <
fernando.frediani at upx.com> wrote:

> Hi Denis, understood.
> What if in the case of adding a fourth host to the running cluster, will
> the copy of data be kept only twice in any of the 4 servers ?
>

replica volumes can be build only from 2 or 3 bricks. There is no way to
make a replica volume from a 4 bricks.

But you may combine distributed volumes and replica volumes [1]:

gluster volume create test-volume replica 2 transport tcp server1:/b1
server2:/b2 server3:/b3 server4:/b4

test-volume would be like a RAID10 - you will have two replica volumes
b1+b2 and b3+b4 combined into a single distributed volume. In that case you
will
have only two copies of your data. Part of your data will be stored twice
on b1 and b2 and another one part will be stored twice at b3 and b4
You will be able to extend that distributed volume by adding new replicas.


[1]
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Setting%20Up%20Volumes/#creating-distributed-replicated-volumes
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