Disc size for cluster

[Raphael Vogel]

Hi

Just want to validate my estimation for a C* cluster which should have around 3 TB of usable storage.

Assuming a RF of 3 and SizeTiered Compaction Strategy.

Is it correct, that SizeTiered Compaction Strategy needs (in the worst case) 50% free disc space during compaction?

 

So this would then result in a cluster of 3TB x 3 x 2 == 18 TB of raw storage?

 

Thanks and Regards

Raphael Vogel