I haven't seen any information that has a shutdown procedure laid out but if your using a cluster it should be as simple as placing one host in maintenance mode. Once all the VMs are vmotioned to other members of the cluster you can shutdown. This assumes that you are using shared storage and can utilize VMotion. If not then the proper procedure would be to simply have all of the guest on that vSphere host powered off, enter maintenance mode, shutdown and upgrade memory.
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