title: Ask for cassandra benchmark result
body: <p>I recently used 9 cassandra VMs on openstack to test our product. Each VM has 16vCPUs, 50GB SSD and 20GB memory, but I find each node can only bear 10000+ opers/second with 70% CPUu, that is 90000 opers for 9 nodes.</p>
  <p>The data model is simple read/write mixed scenario on normal tables, I haven't seen any obvious performance bottleneck during the test. From internet I can see some guys can achieve 4000 opers/s on AWS T2 medium nodes(only 2 vCPU) and some cassandra training materials say they can achieve 6000-12000 transactions per second.</p>
  <p>Can anyone share your benchmark results on apache cassandra?</p>