1 – no
3 – you are incorrect – there is no rscd agent for esxi. Powercli to vcenter is one way you can do the esxi patching.
Ohh yes, the RSCD agent is available for vCenter server & not for ESXi.
So you mean to say, we can make use of PowerShell or PowerCLI scripts with nexec to vCenter server on which ESXi host resides to perform patching.
Is that right & any documentation available on this?
I’m sure vmware has this documented or someone on the interwebs has done this in power cli. So get that part working, and then you need to get it into bsa. a nsh script. blpackage, etc.