HCIBench is a synthetic benchmarking tool. It runs vdbench (newer versions can also run FIO) to generate the load. It will deploy its own VMs running Proton OS. So no, you can't use it to test application performance of Cassandra, but you can use it to test the performance of your underlying storage to give you an idea of how it will perform with Cassandra.
"Right now,some of the VMs are in production.Can we run this HCI Bench tool to find out the IOPS right?"
I wouldn't advise running any form of intense stress testing in conjunction with Production VMs as these can intentionally push the underlying storage and network to its limits - if you are required to do that then migrate the VMs (storage or storage+compute) off vsanDatastore or schedule a downtime for the VMs.
Regardless of whatever workload testing you are running on vSAN, a lot of information on the IOPS/Throughput can be obtained from the vSphere Performance charts e.g.:
Cluster > Monitor > Performance
or from observer data online or persisted initiated from RVC:
Great Bob.Thank you your inputs.
Thanks for your response.
Sorry for the confusion.I had 2 doubts.
1) HCI benchmark testing
2) Cassandra DB integration with VCD.
I got the Cassandra database metric path(Metrics location from Yaml file.