When one virtual system goes down, there space in the server room for the backup to kick in. Or in this case, the Parallel virtual machine to take over. I think you have it all wrong and not thinking how a Datacenter works.
To put it straight forward, companies who setup Virtual servers also have their backups, those who don't fail in the matter you metioned. Now the backup system is normally running in parallel with the other so if something does happen, the incoming traffic will go to the other server. The same way a SAN or RAID array works. When one HD fails the data on the other takes over without any loss of data. The result in the server is hardware being replaced and being brought back online without any interruption. The only thing users will see is a bit of a slow down due to the lack of processing time from the remaining CPUs.
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