Linked by Amjith Ramanujam on Mon 14th Jul 2008 21:55 UTC, submitted by SK8T
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Member since:
2005-07-06
S/390 can support nested virtualisation in hardware, I think. You might well be running z/VM on the bare hardware and Linux in guests (I understand this is normal). But this should make it easy to run guest operating systems inside those guests. Since I think the hardware is designed with this in mind, it might not be as prohibitive, performance-wise, as you might think.
One advantage of this would be that you can carve up the machine coarsely using z/VM and give the resulting VMs to various business groups or individuals and then say "If you need more partitioning, use KVM and do it yourself".
I don't know if anybody ever runs Linux on the bare metal hardware. I guess it's not inconceivable that IBM are looking at deprecating z/VM in favour of leveraging Linux+KVM but I'm not sure getting rid of z/VM would be The IBM Way. Just having KVM available for nested virtualisation seems like a useful result in itself, so I assume that's what they're thinking of.