Briefly: if I have 5 Tb of data and want to deploy this on 5 cassandra servers - does each machine need to have 5 Tb of disk space for data (not counting log space)? From the docs it sounds like at times cassandra will need 2x the data size - so 10Tb / server or 10Tb total in the array?
How much RAM should each machine have? Assume that the 5Tb is all in the same column space. I had been planning to max out the RAM on each machine but I'm not sure that's enough. Do I need an array of servers with a total of 5Tb of RAM?