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Current data density limits with Open Source Cassandra


Back in the day it was recommended that max disk density per node for Cassandra 1.2 was at around 3-5TB of uncompressed data. 

IIRC it was mostly because of heap memory limitations? Now that off-heap support is there for certain data and 3.x has different data storage format, is that 3-5TB still a valid limit?

Does anyone have experience on running Cassandra with 3-5TB compressed data ?