Hi,

I have troubles finding some quantitative information as to how a healthy 
Cassandra node should look like (CPU usage, number of flushes,SSTables, 
compactions, GC), given a certain hardware spec and read/write load. I have 
troubles gauging our first and only Cassandra node, whether it needs tuning or 
is simply overloaded.
If anyone could point me to some data that would be very helpful.

(So far I have run the node with the default settings in cassandra.yaml and 
cassandra-env. The log claims that the server is occasionally under memory 
pressure and I get frequent timeouts for writes.  I see what I think are many 
flushes, compactions and GCs in the log. Some toying with heap and new gen 
sizes, key cache, and the compaction throughput settings did not improve the 
overall situation much.)


Thanks!
Ralf

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