One of my customer upgraded the vSAN cluster to 7.0 U3d from 6.7 U3, unfortunately my customer reported the performance of some virtual machines is dropped. We have opened the SR to VMware GSS, but they do not find out the reason. I search some useful information in the internet, it may be related to a known issue exists on vSAN 7.0. I shared the following information to VMware GSS, now we are waiting for confirmation from VMware.