The "distance" in between the hosts should be maximized,
being a seperate
routed networks, seperate storage etc to have the risks
minimized.
Personally, I would not mix the two, unless having spent a LOT
of time in
isolating things, just as you would do with two physical
hosts.
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Well even though they are on the same machine, they are indeed on
seperate routed networks/bridges (Public ones have public IPS, internal ones
have private IPs). The VMs will share storage though, however I'll remember to
zero the LVs before giving them to customers.