On 4/9/20 12:47 PM, Strahil Nikolov wrote:
On April 9, 2020 5:16:47 PM GMT+03:00, Valerio Luccio <valerio.luc...@nyu.edu>
wrote:
Hi,
I'm afraid I still need some help.
When I originally set up my gluster (about 3 years ago), I set it up as
Distributed-Replicated without specifying a replica count and I believe
that defaulted to a replica 2. I have 4 servers with 3 RAIDs attached
to
each server. This was my result:
Number of Bricks: 6 x 2 = 12
Transport-type: tcp
Bricks:
Brick1: hydra1:/gluster1/data
Brick2: hydra1:/gluster2/data
Brick3: hydra1:/gluster3/data
Brick4: hydra2:/gluster1/data
Brick5: hydra2:/gluster2/data
Brick6: hydra2:/gluster3/data
Brick7: hydra3:/gluster1/data
Brick8: hydra3:/gluster2/data
Brick9: hydra3:/gluster3/data
Brick10: hydra4:/gluster1/data
Brick11: hydra4:/gluster2/data
Brick12: hydra4:/gluster3/data
If I understand this correctly I have 6 sub-volumes with Brick2 replica
of Brick1, Brick4 of Brick3, etc. Correct ?
I realize now that it would probably have been better to specify a
different order, but now I cannot change it.
Now I want to store oVirt images on the Gluster and it requires either
replica 1 or replica 3. I need to be able to reuse the bricks I have
and
was planning to remove some bricks, initialize them and add them back
as
a replica 3.
Am I supposed to remove 6 bricks, one from each sub-volume ? Will that
work ? Will I lose storage space ? Can I just remove a brick from each
server and use those for the replica 3 ?
Thanks for all the help.
Hi Valerio,
You can find a small system and make it an arbiter , so you will end up with
'replica 3 arbiter 1' .
The arbiter storage calculation is that you need 4K for each file in the
volume.If you don't know them the general rule of thumb is your arbiter brick
be 1/1024 the size of the data brick.
Keep in mind that it will be better if your arbiter has an SSD (for example
mounted on /gluster) from which you can create 6 directories.The arbiter stores
only metadata and the SSD random access performance will be the optimal
approach.
Something like:
arbiter:/gluster/data1
arbiter:/gluster/data2
arbiter:/gluster/data3
arbiter:/gluster/data4
arbiter:/gluster/data5
arbiter:/gluster/data6
Of course , proper testing on a test volume is a good approach before
implementing on prod.
Best Regards,
Strahil Nikolov
Thanks,
that sounds like a great idea.
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