That is a cluster that’s in production.
Yes, you can increase or decrease the replication factor of a running cluster.
Note that it’s generally not recommended to use an RF lower than 3, and if you’re using a multi datacenter setup, probably RF=3 in each datacenter.
To actually change the replication factor you’ll want to:
-
Alter the RF for the keyspace
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If:
- You’re reducing the RF: Run nodetool cleanup on the keyspace you modified
- You’re increasing the RF: follow the steps in the How to Safely Increase the Replication Factor section
You can read more about this in the Fault Tolerance section, and in the Architecture lesson in ScyllaDB University.
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