Are you putting both the commitlogs and the Sstables on the adds? Consider 
moving your snapshots often if that’s also taking up space. Maybe able to save 
some space before you add drives.

You should be able to add these new drives and mount them without an issue. Try 
to avoid different number of data dirs across nodes. It makes automation of 
operational processes a little harder.

As an aside, Depending on your usecase you may not want to have a data density 
over 1.5 TB per node.

Rahul Singh

Anant Corporation

On Mar 7, 2018, 1:26 AM -0500, Eunsu Kim <>, wrote:
> Hello,
> I use 5 nodes to create a cluster of Cassandra. (SSD 1TB)
> I'm trying to mount an additional disk(SSD 1TB) on each node because each 
> disk usage growth rate is higher than I expected. Then I will add the the 
> directory to data_file_directories in cassanra.yaml
> Can I get advice from who have experienced this situation?
> If we go through the above steps one by one, will we be able to complete the 
> upgrade without losing data?
> The replication strategy is SimpleStrategy, RF 2.
> Thank you in advance
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