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I Ran into a problem with trying to do 64 bit virtualization using an older Operton 248 processor on a Sun V20z. After doing a ton of digging with
all the determination in the world to make it work, I finally realized there is no way to do it. Going down the the AMD 248 architecture guide, which
I found from some other posts, the problem was down at the register level of the processor. This was on a Sun V20z server which
runs 64bit OS units just fine, but you can't have a guest OS running in 64 bit.

Tried Citrix XEN, VMware 3.5, and Sun's VirtualBox just to find any way around it.

Moral of this story is that a V20z will do 32bit guest OS images just fine, and run a 64 bit OS as stand alone just fine. Don't try to
host a 64 bit OS on it.

If you want to do any kind of 64 bit guest OS virtualization on an Opteron, best rule of thumb is to have a 4 digit processor number such as
1210, 2218, etc.... Most all of these model CPUs support the AMD-V setting.

This would hold true with any of the early AMD Opteron processors, not just a V20z...

Hi,

Is it possible to have 64bit OS for host and run 32 bit OS for Guests on this machine ?

Thanks in advance.

Hi,

Is it possible to have 64 bit OS for Host and run 32 bit OS for Guest on this machine?

Thanks in advance.

Yes, absolutely you can run how ever many 32bit VM on this server as the configuration will sustain.
Only problem is not being able to have a 64bit guest OS, 32bit Guest OS images are fine.

Hope this helps.

Thanks a lot for quick reply
This answers my question.

Kind regards.