Reply to post: Re: This has been around since VM 1970s...

Sysadmin sank IBM mainframe by going one VM too deep

aqk
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Re: This has been around since VM 1970s...

Back in the '70s, as a VM system programmer, I once had three levels of VM/HPO set up just for fun, and occasionally installed or upgraded a new VM system under the old production VM. i.e. two levels.

And I did know someone that apparently had tested at least seven levels of VM, but he worked for IBM, and lots of toys to play with.

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