martyscholes wrote:) Does this count?
Sort of. In my case I had an older OpenSolaris install where it was common for users to run VirtualBox (windows / linux guests) from their Sun Ray Gnome sessions on the server. I wanted to install S11 with minimal downtime.
Ideally, I would have installed a hypervisor on the bare metal, running OpenSolaris on one DomU amd testing the S11 install on another, tweaking S11 until everything was perfect then cutting the users over.
But no, it seems nesting is taboo. ...
... It must have been in the early 90s when I visited a large mainframe installation. They were explaining to me that they ran MVS for their new apps and VSE for the older apps. They had several dev, build and test instances of each OS and a slick way to snap the QA instances back to a known state for each testing run. They also had a set of OS images simulating outside services against the test instances. They ran the dozen or so OS images on a single frame with VM as the hypervisor. But here's the cool part: they tested code deployment. To test deployment, they would stage a release and test deployment with a copy of the above prod, QA, test, etc. instances, even including a set of vendor simulation instances.
When it was all said and done, at any time they were running virtual machines several layers deep. Cool stuff.
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