[Gluster-users] Replica 2 to replica 3

Valerio Luccio valerio.luccio at nyu.edu
Thu Apr 9 14:16:47 UTC 2020


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
    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.

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Valerio Luccio 		(212) 998-8736
Center for Brain Imaging 		4 Washington Place, Room 158
New York University 		New York, NY 10003

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