I personally want three copies of my data, more akin to RAID 6(ish) so in
my case replica 3 makes perfect sense.

On Mon, Apr 24, 2017 at 11:34 AM, Denis Chaplygin <dchap...@redhat.com>
wrote:

> Hello!
>
> On Mon, Apr 24, 2017 at 5:08 PM, FERNANDO FREDIANI <
> fernando.fredi...@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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