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 : > > 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. > > >  https://gluster.readthedocs.io/en/latest/Administrator% > 20Guide/Setting%20Up%20Volumes/#creating-distributed-replicated-volumes > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > >
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