AW: [Xen-users] Allocate more Memory than real

["Steffen Heil" <lists@xxxxxxxxxxxxxxx>]

Hi

> Is possible in xen to allocate more memory to virtual machines than the
real  memory?

Yes and No.

You can "prepare" domUs to use some amount of memory, and then assign it
some lower memory.

The sum of all "prepared" memory sizes MAY exceed the total amount of real
memory.
The sum of the assigned memory sizes MAY NOT exceed the total amount of real
memory.

Also note, that the dom0 itself also counts. (It usually is prepared to use
ALL memory and only uses what's left from the domUs.)

Also note, that "total or real memory" in this context always refers to the
amount of memory you have physically installed MINUS the memory Xen itself
needs/uses.
So the sum of all running domains (including dom0) can never reach you
physical memory limit.

Regards,
  Steffen

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