I have setup 4 node cluster for testing and all of them have around 25gb of data.
I ran a read and write tests using 100 and 200 threads with each thread reading or writing 50 columns with quorum consistency using stress tool against 4 nodes Test servers have 4 cores and 16gb of ram. While running the test a) I am not seeing cpu usage more than 10pct. In some of the forums, i see that 8 cpu 32 gb is considered as good sweet spot for cassandra. Is this true? Also when would I see real cpu spikes. At this moment looks like 4 core is more than sufficient. B) iostat -x is reporting avgqueue size of around 0.25 and await time of around 30 ms. What would be acceptable queue size and await time? Please help Thanks Baskar
