I run a 10-node Cassandra cluster in production. 99% writes; 1% reads, 0% deletes. The nodes have 32 GB RAM; C* runs with 8 GB heap. Each node has a SDD for commitlog and 2x4 TB spinning disks for data (sstables). The schema uses key caching only. C* version is 2.1.2.

It can be predicted that the cluster will run out of free disk space in not too long. So its storage capacity needs to be increased. The client prefers increasing disk size over adding more nodes. So a plan is to take the 2x4 TB spinning disks in each node and replace by 3x6 TB spinning disks.

( -- also posted on StackOverflow )

Thanks in advance.

Med venlig hilsen / Best regards,

Thomas Borg Salling

Freelance IT architect and programmer.
Java and open source specialist.

tbsalling@tbsalling.dk :: +45 4063 2353 :: @tbsalling :: tbsalling.dk :: linkedin.com/in/tbsalling