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Exactly - two 6 TB HDD's may be a lot less expensive, but the performance compared to SSD would be insanely different.
How many HDDs would you need to reach your IOPS requirements?
I've never monitored them.
The work is being done by Dom0, not the VM.
And with the resources being statically assigned I can't imagine that there is much of a hit to the performance of the VM's them self.
Quite a while means several months, not years.
http://www.xenserver.org/
