[Gluster-users] adding new bricks for volume expansion with 3.0.x?

[mki-glusterfs at mozone.net]

Hi

How does one go about expanding a volume that consists of a distribute
-replicate set of machines in 3.0.6?  The setup consists of 4 pairs 
of machines, with 3 bricks per machine.  I need to add an additional 5
pair of machines (15 bricks) to the volume, but I don't understand 
what's required per se.  There are currently 4 client machines mounting
the volume using the ip.of.first.backend:/volume syntax in fstab where
the first backend server provides the general volume to the clients.

Looking at some of the past mailing list chatter, it seems scale-n-defrag.sh
is what I need, but it's unclear as to how to go about this without 
distruption to services on the other clients.  If I bring up a new client 
server, copy the vol file and mount that vol using that volfile temporarily 
to run the defrag, do I have to make all the existing clients also mount that
exact same vol file while this is running?  Or can they keep running on their
old volfile for the duration of the defrag?  The last time I tried modifying 
the vol file by even 1 byte, on the backend that was serving it up, the 
clients refused to mount it, so not sure how that's supposed to work in this 
case?

Can someone please shed some light into what the correct process to go 
about this is?

Thanks much.

Mohan