On Fri, Jan 21, 2011 at 2:19 AM, Mick Semb Wever <m...@apache.org> wrote: > >> Of course with a SAN you'd want RF=1 since it's replicating >> internally. > > Isn't this the same case for raid-5 as well?
No, because the replication is (mainly) to protect you from machine failures; if the SAN is a SPOF then putting more replicas on it doesn't help. > And we want RF=2 if we need to keep reading while doing rolling > restarts? Yes. -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
