VMware Update Manager (VUM) has an option to "Stage" patches to a Host. This is supposed to copy patches to the Host ahead of time so that when you have your maintenance window you can install patches immediately without having to wait for them to be downloaded.
I have not had good luck with Staging patches. It seems like there are always some patches that do not get staged. Worse, I think (but have not confirmed) that the Host re-downloads everything (even patches identified as "staged").
What causes patches to not get staged? Maybe there are certain patches that cannot be staged -- if so is there a way for me to identify which patches cannot be staged ahead of time?
I am running vCSA 6.7.0.44100 (Build 16275304).