I thank everyone for their input. I prefer to have the guests suspend
rather than shutdown because many of my customers start things up manually and
get annoyed when they come back to find them not running. Most of the time
it is for a simple reboot of the host to make a new kernel or some other update
active. This particular time though I had to move all the equipment to a new
co-location facility because the old provider had become far too greedy.
So I guess rdate -s is probably the best solution.
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