Yes, Cassandra should keep percent of disk usage equal for all disk. Compaction 
process and SSTable flushes will use new disk to distribute both new and 
existing data.

Best regards, Vladimir Yudovin, 

Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
Launch your cluster in minutes.

---- On Mon, 17 Oct 2016 11:43:27 -0400Seth Edwards <> 
wrote ----

We have a few nodes that are running out of disk capacity at the moment and 
instead of adding more nodes to the cluster, we would like to add another disk 
to the server and add it to the list of data directories. My question, is, will 
Cassandra use the new disk for compactions on sstables that already exist in 
the primary directory? 


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