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1. what is the typical scenario to customize the esxi? to install drivers and VIBs? to optimize performance?
-- We use a customized ISO for installations as you can add latest drivers and patches. This saves time in the long run as you don't have to update the host once it's installed. We're a Cisco UCS shop and I'll start with the Cisco base ISO and update the drivers to the latest supported version and update with the patches and I'm good to go.
2. can the "communitysupported" VIBs be inserted to esxi iso?
-- Yes
3. can the existing VIBs that already embedded in the official ESXi be removed to create a custom ESXi?
--Yes, I have done this also before. If you're doing network installs this can greatly speed up the installation time. VMTools package is about have of the space. We repoint our VMtools to a different datastore so we have control on when VMtools versions get updated. You can also remove unneeded drivers.
This can all be built using powershell. This link should get you pointed in the right direction