In order to migrate from my current DRBD+OCFS2 2-node setup to a 2-node
GlusterFS setup, I would need to do the following:
* extract one node from my old DRBD+OCFS2 cluster (easy)
* reinstall it as as a new single-brick-based GlusterFS storage server (easy)
* rsync data from my old (now one-legged) DRBD+OCFS2 storage to new Gluster
storage server (easy)
* reinstall second node from DRBD+OCFS2 cluster as a Gluster replica
I see contradictory postings regarding the possibility of adding
a replica (some links below). What I've tried is this:
# on fiori2, the first GlusterFS node:
mkdir /vol/brick0/vmimages
gluster volume create vmimages fiori2:/vol/brick0/vmimages
gluster volume start vmimages
mount fiori2:/vol/brick0/vmimages /mnt
rsync -a <my-old-drbd+ocfs2-cluster-remaining-node>:/.../ /mnt/
# still on fiori2, try to add the second node's brick to the volume:
gluster peer probe torchio2
gluster volume add-brick vmimages replica 2
torchio2:/vol/brick0/vmimages
This reports success, but I see no evidence of success; I expected
to see a synchronisation process started, but this doesn't happen.
Attempts to rebalance, just tell me it is not a distributed volume
(correct, it's meant to replicated, but not distributed).
I also tried creating the volume specifying that there are (meant to
be) two replicas, but providing the name of only one of them:
gluster volume create vmimages replica 2 fiori2:/vol/brick0/vmimages
but this also failed, telling me I needed to specify more bricks.
So my questions are:
Is it possible to increase the number of replicas after the volume
has been initialised? If yes, then how? Link please. Many thanks!
Alexis
PS Links:
https://github.com/matiu2/rackspace-articles/blob/master/glusterfs/how-to-add-and-remove-a-node.md
(right at the bottom)
http://servertopic.com/topic/xA0e-glusterfs-how-to-add-replica-brick-to-system
(right at the bottom)
http://prefetch.net/blog/index.php/2011/11/27/some-interesting-insights-on-the-gluster-replicated-volume-replica-value/
https://www.gluster.org/pipermail/gluster-users/2011-March/006905.html (says
you can't)
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