On 9/22/2010 3:14 PM, Stephen Powell wrote:
That may be true for some virtualization software, but not for all.
My "day job" is as a system programmer for IBM mainframe systems,
and among my duties is responsibility for a z/VM system. In z/VM,
nested virtualization is not difficult, pointless, or unstable. I routinely
install a new release of z/VM in a virtual machine running under
the production release of z/VM, for example. There's even instructions
in IBM's installation manuals for how to do this.
This is the exception that proves the rule. I still think that doing it
under an AMD64 or Intel x86_64 is probably futile under the current
state-of -the-art.
I know it's been done under a XEN hypervisor. I don't know about
Virtualbox. If you do it and it's stable, like I asked another poster
in another thread, please write a HOWTO and show everyone how it's done.
I am aware of the old MVS and all that, running DOS and CMS and so on
all at the same time, but I'm a decade too young to have any experience
with that. All I can say I've done is write COBOL and JCL with Report
Writer under WYLBUR for a class.
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