Re: Question about heterogeneous bricks

[Ravishankar N <ravishankar@xxxxxxxxxx>]

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@xxxxxxxxx> 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@xxxxxxxxx>:

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@xxxxxxxxx> 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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