Hi Stefan. Can you share the output of nodetool cfstats?
We are running a 3-node cluster with Cassandra 0.6.13.
We are in the process of upgrading to 1.x, but can't do so for a while because we can't take the cluster offline.
Until now 0.6.13 has run without problems, but lately we are getting some performance issues.
We are getting timeouts on both reads and writes.
The cluster contains a lot of "old" data which is only read very occasionally and not written to at all.
Is it possible for this data to negatively impact the performance of the cluster?
If so, would it help to move this data to another columnfamily/keyspace?