On Wed, Sep 4, 2013 at 12:38 PM, Langston, Jim <Jim.Langston@compuware.com> wrote:
I have built a new 4 node cluster and would like to move the data
from the current 2 node cluster to the new cluster. What would be
the best way to move the data and utilize it on the new cluster. I 
have looked at snapshot and also just copying the entire tree from
the old cluster to the new cluster. Not sure what the best practice
would be. I'm testing that process now in preparation for moving the
current data (production) to the new larger ring (systems are bigger
and more memory) and decommission the older ring (smaller systems,
less memory).

http://www.palominodb.com/blog/2012/09/25/bulk-loading-options-cassandra

In your case, I would just copy all sstables to all target nodes and run cleanup.

=Rob