On Fri, 19 Feb 2010 11:41:07 -0500, George Henke wrote:

>Let's face it, even by IBM's admission, PR/SM is little more than VM in
>microcode.

The implementation of PR/SM is indeed similar to VM.  It may even share 
quite a bit of code, but it is not virtual.  You have to allocate the processor 
storage to each LPAR.  Real devices have to be provided for each of them.
Consoles, for example.

>So why put VM in microcode in the first place 

PR/SM was implemented because Amdahl had MDF and their customers liked it.

>and limit us to only 60 LPARs.

That is a lot of LPARS when you consider that you have to allocate storage 
to each of them.  How much memory do you have, and how many ways are 
you willing to divide it?

-- 
Tom Marchant

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