[Cassandra Wiki] Update of "Operations" by MakiWatanabe

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The "Operations" page has been changed by MakiWatanabe:
http://wiki.apache.org/cassandra/Operations?action=diff&rev1=98&rev2=99

Comment:
Update cli command syntax to change replication factor

  
  To update the replication factor on a live cluster, forget about cassandra.yaml. Rather you want to use '''cassandra-cli''':
  
-  . update keyspace Keyspace1 with replication_factor = 3;
+  . update keyspace Keyspace1 with strategy_options = {replication_factor:3};
  
  === Network topology ===
  Besides datacenters, you can also tell Cassandra which nodes are in the same rack within a datacenter.  Cassandra will use this to route both reads and data movement for Range changes to the nearest replicas.  This is configured by a user-pluggable !EndpointSnitch class in the configuration file.