I have a 20 node scylla db cluster and each node is at 70% disk space usage. I want to switch to leveled compaction strategy from Size tiered strategy. Can I do that with this much disk space left? How much disk space at max will be required?
As was mentioned, you don't have enough disk space to switch compaction strategies. I can think of 2 or possibly 3 ways to work around this.
nodetool cleanup
on the cluster to reclaim the unused space.