Restore snapshots suggestion

[Daning]

If I need to restore snapshots from all nodes, but I can only shutdown 
one node a time since it is production, is there a way I can stop data 
syncing between nodes temporarily? I don't want the existing data 
overwrites the snapshot. I found this undocumented parameter  
DoConsistencyChecksBoolean(http://www.datastax.com/dev/blog/whats-new-cassandra-066) 
to disable read repair,  what is the proper way to do it?

I am on 0.8.6.

Thank you in advance,

Daning