[Gluster-users] Reconfiguring volume type
Rahul C S
rahul at gluster.com
Wed Feb 16 05:49:06 UTC 2011
For your first question, the answer right now is No and so you cannot change a volume type from distributed to distributed-replicate with gluster 3.1.2 online.
You would have to delete the volume and create a new volume with type distribute replicate using:
$ gluster volume create <VOLNAME> replica 2 <brick1> <brick2> <brick3> <brick4>
(A volume must have 4 bricks to become a distributed-replicate volume)
However if you have a replicate volume with count 2 already created, then you just need to add 2 more bricks and it will automatically become a distributed replicate volume.
This can be scaled to 6 bricks by adding 2 more bricks again and these steps can be done when the volume is online itself.
For the last question,
"remove-brick" command does not migrate data, the data in that brick cannot be accessed from the client unlike "replace-brick" which actually migrates data from one brick to the another.
----- Original Message -----
From: "Udo Waechter" <udo.waechter at uni-osnabrueck.de>
To: gluster-users at gluster.org
Sent: Tuesday, February 15, 2011 11:23:39 PM
Subject: [Gluster-users] Reconfiguring volume type
I have been looking around the web but did not find a satisfying answer.
Is it possible to change a volume type from distributed to distributed+replica with gluster 3.1.2?
An online way at least?
The manpage suggests that I can do:
$ gluster volume add-brick <VOLNAME> [(replica <COUNT>)|(stripe <COUNT>)] <NEW-BRICK> ...
I tried to add additional bricks to an existing distribute-type volume by:
gluster volume add-brick testvol replica 2 <newbrick>
I have 3 bricks in a distribute volume and would like to add additional 3 bricks to have it distribute+replicate.
I can do it offline by (something like):
- stop the volume
- delete it
- recreate it with addtional replicate bricks.
I guess i need to take care that the data from the bricks is somehow synched to just one or so...
Last small question: If I "gluster remove-brick" one brick, does its data get migrated to the other bricks? This is the case with "replace-brick".
Thanks for your time and thoughts,
:: udo waechter - root at zoide.net :: N 52º16'30.5" E 8º3'10.1"
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