We have configured Cassandra to run on a separate D drive but noticed that during compaction, it also uses a lot of space of our C partition, where we have the OS and DataMiner. Because the C partition has less space, we wonder about any action to prevent this situation...
Gelber Mahecha [SLC] [DevOps Enabler] Selected answer as best 13th October 2020
During compaction, there should not be extra writes to drive C, unless Cassandra needs memory and Windows starts using a page file.
If correctly configured to have Cassandra on an separate drive D, drive C should only be used for:
- Commit logs (where Cassandra temporarily saves new data)
- Hint files (used for synchronization with other Cassandra nodes, such as on a Failover system)
Both of these are unrelated to compaction.
Wouter Demuynck [SLC] [DevOps Advocate] Answered question 12th October 2020