I had a question from a customer earlier who wanted to test the vSAN Stretched Cluster functionality that was introduced in 9.0 called Site Maintenance. Yes it is indeed what you would expect it to be, a new feature that allows you to place a whole site into maintenance mode at once. Very useful, but this customer was unable to find the button in the UI. Which, by the way, is not strange, as this capability (along with the Manual Site Takeover) capability is only available through an RPQ request at the moment, and it is also only available for vSAN OSA for now, so keep that in mind when filing an RPQ through your Broadcom/VMware contact! When you get approved, you will be informed on how you can get this functionality enabled, and then it will be added in the UI on the fault domain level as shown in the screenshot below, taken from my 9.0 lab!
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