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Compacting more than the actual used space


We have an ongoing compaction for roughly 2.5 TB, but "nodetool status" reports a load of 1.09 TB. Even if we take into account that the load presented by "nodetool status" is the compressed size, I very much doubt that compression would work to reduce from 2.5 TB to 1.09.
We can also take into account that, even if this is the biggest table, there are other tables in the system, so the 1.09 TB reported is not just for the table being compacted.

What could lead to results like this? We have 4 attached volumes for data directories. Could this be a likely cause for such discrepancy?

Bonus question: changing the compaction throughput to 0 (removing the throttling), had no impacts in the current compaction. Do new compaction throughput values only come into effect when a new compaction kicks in?

Pedro Gordo