In last 4 days, The node's Performance Capacity is very high constantly reaches >100%, or even >150%, AFF/SDD aggregate's Performance Capacity is only about 30%.
My understanding is Peformance Capacity is just telling you, you cannot add more workloads. Does that necessraily tell you if are having performance issue?
An application is slow. It is based on VM's and NFS datastore . But the Datastore volume seems okay, latency is not too high, only < 5ms. The latency graph of the volume doens't match with the slow response.
So, we are not sure if we have resources contention, and if Node's Perfomance Capacity is indicating an issue?
Ok, so you're doing close to 3 GB/s in this cluster it looks like. That's pretty impressive. Most of those are writes. It looks like Exempt and Nwk_Exempt are probably the busiest, so I'm suspecting that's due to write workload. My honest feel from just those commands is, you are just doing quite a bit of work and are at a comfortable limit with what the controller can handle without adding more work.
If you want to open a case you can, or if you have a hostname/serial and perf archive I can take a deeper look at some actual numbers.