Restore cluster from disk snapshot

[Henning Blohm]

On a 10 nodes cluster running Hadoop 2.6 and HBase 1.0 we would like to 
be able to restore the whole cluster from a disk snapshot backups.

Given that snapshots for data nodes and name node may not be taken at 
the 100% exact same point in time, is there a safe variant that at least 
means the cluster is still consistent (except for some late edits maybe)?

Thanks,
Henning