Gluster users - Apr 2012 - Best practice: Scaling down / Removing Servers

We have some issues with the RAID-Controller of our gluster servers. We
decided to buy complete new servers to replace the others but it is quite
unclear how to perform this task without downtime.

It is possible to add the new servers to the volume, rebalance it and then
get all the data off the old servers and remove them after this?
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As I read the new 3.3b3 FAQ, yes.   The remove-brick feature can do 
this (altho I have not yet tried it - maybe later this next week).

<http://community.gluster.org/q/what-s-new-in-glusterfs-3-3/>

hjm

On Saturday 14 April 2012 02:36:41 Philip wrote:
> We have some issues with the RAID-Controller of our gluster
> servers. We decided to buy complete new servers to replace the
> others but it is quite unclear how to perform this task without
> downtime.
> 
> It is possible to add the new servers to the volume, rebalance it
> and then get all the data off the old servers and remove them
> after this?
-- 
Harry Mangalam - Research Computing, OIT, Rm 225 MSTB, UC Irvine
[ZOT 2225] / 92697  Google Voice Multiplexer: (949) 478-4487
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On Sat, Apr 14, 2012 at 11:36:41AM +0200, Philip wrote:
>    We have some issues with the RAID-Controller of our gluster servers. We
>    decided to buy complete new servers to replace the others but it is
>    quite unclear how to perform this task without downtime.
>    It is possible to add the new servers to the volume, rebalance it and
>    then get all the data off the old servers and remove them after this?
I'm no expert, but isn't that what replace-brick does?
http://download.gluster.com/pub/gluster/glusterfs/3.2/Documentation/AG/html/sect-Administration_Guide-Managing_Volumes-Migrating.html