I just imported a lot of data in a 9 node Cassandra cluster and before I create a new ColumnFamily with even more data, I'd like to be able to determine how full my cluster currently is (in terms of memory usage). I'm not too sure what I need to look at. I don't want to import another 20-30GB of data and realize I should have added 5-6 more nodes.

In short, I have no idea if I have too few/many nodes right now for what's in the cluster.

Any help would be greatly appreciated :)

$ nodetool -h 192.168.1.87 ring
Address         DC          Rack        Status State   Load            Owns    Token                                       
                                                                               151236607520417094872610936636341427313     
192.168.1.87    datacenter1 rack1       Up     Normal  7.19 GB         11.11%  0                                           
192.168.1.86    datacenter1 rack1       Up     Normal  7.18 GB         11.11%  18904575940052136859076367079542678414      
192.168.1.88    datacenter1 rack1       Up     Normal  7.23 GB         11.11%  37809151880104273718152734159085356828      
192.168.1.84    datacenter1 rack1       Up     Normal  4.2 GB          11.11%  56713727820156410577229101238628035242      
192.168.1.85    datacenter1 rack1       Up     Normal  4.25 GB         11.11%  75618303760208547436305468318170713656      
192.168.1.82    datacenter1 rack1       Up     Normal  4.1 GB          11.11%  94522879700260684295381835397713392071      
192.168.1.89    datacenter1 rack1       Up     Normal  4.83 GB         11.11%  113427455640312821154458202477256070485     
192.168.1.51    datacenter1 rack1       Up     Normal  2.24 GB         11.11%  132332031580364958013534569556798748899     
192.168.1.25    datacenter1 rack1       Up     Normal  3.06 GB         11.11%  151236607520417094872610936636341427313

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# nodetool -h 192.168.1.87 cfstats
  Keyspace: stats
cassandra
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