[Gluster-users] Question about heterogeneous bricks

[Ravishankar N]

On 02/21/2017 05:17 PM, Nithya Balachandran wrote:
> Hi,
>
> Ideally, both bricks in a replica set should be of the same size.
>
> Ravi, can you confirm?
>

Yes, correct.
-Ravi

> Regards,
> Nithya
>
> On 21 February 2017 at 16:05, Daniele Antolini <lantuin at gmail.com 
> <mailto:lantuin at gmail.com>> wrote:
>
>     Hi Serkan,
>
>     thanks a lot for the answer.
>
>     So, if you are correct, in a distributed with replica environment
>     the best practice is to pair nodes with the smallest size together?
>
>     For example:
>
>     node1      1 GB
>     node2     10 GB
>     node3      4 GB
>     node4     8 GB
>     node5     15 GB
>     node6     7 GB
>
>     So:
>
>     node1 with node3 (smallest is 1 GB)
>     node4 with node6 (smallest is 7 GB)
>     node2 with node5 (smallest is 10 GB)
>
>     The command to launch:
>
>     gluster volume create gv0 replica 2
>     node1:/opt/data/gv0 node3:/opt/data/gv0 node4:/opt/data/gv0
>     node6:/opt/data/gv0 node2:/opt/data/gv0 node5:/opt/data/gv0
>
>     Right? In this way I should have 18 GB of free space on the
>     mounted volume (1 GB + 7 GB + 10 GB)
>
>
>
>     2017-02-21 11:30 GMT+01:00 Serkan Çoban <cobanserkan at gmail.com
>     <mailto:cobanserkan at gmail.com>>:
>
>         I think, gluster1 and gluster2 became a replica pair. Smallest
>         size
>         between them is affective size (1GB)
>         Same for gluster3 and gluster4 (3GB). Total 4GB space
>         available. This
>         is just a guest though..
>
>         On Tue, Feb 21, 2017 at 1:18 PM, Daniele Antolini
>         <lantuin at gmail.com <mailto:lantuin at gmail.com>> wrote:
>         > Hi all,
>         >
>         > first of all, nice to meet you. I'm new here and I'm
>         subscribing to do a
>         > very simple question.
>         >
>         > I don't understand completely how, in a distributed with replica
>         > environment, heterogeneous bricks are involved.
>         >
>         > I've just done a test with four bricks:
>         >
>         > gluster1    1 GB
>         > gluster2    2 GB
>         > gluster3    5 GB
>         > gluster4    3 GB
>         >
>         > Each partition is mounted locally at /opt/data
>         >
>         > I've created a gluster volume with:
>         >
>         > gluster volume create gv0 replica 2 gluster1:/opt/data/gv0
>         > gluster2:/opt/data/gv0 gluster3:/opt/data/gv0
>         gluster4:/opt/data/gv0
>         >
>         > and then mounted on a client:
>         >
>         > testgfs1:/gv0               4,0G   65M 4,0G   2% /mnt/test
>         >
>         > I see 4 GB of free space but I cannot understand how this
>         space has been
>         > allocated.
>         > Can please someone explain to me how this can happened?
>         >
>         > Thanks a lot
>         >
>         > Daniele
>         >
>         >
>         >
>         >
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