Re: LPAR - micro partitioning an i5-520

[Philipp Rusch <philipp.rusch@xxxxxxxxxxxxxxx>]

Philipp Rusch schrieb:
> Al Barsa schrieb:
>   
> > What IBM did with the new 5xx boxes is told you about the number of
> > processors they were going to let you use, and then told the truth about
> > it.  Had they sold you .32 processors, and rounded it to 1.0 (by
> > multiplying everything (by multiplying everything by 3.13,) no one would
> > have been upset, but they didn't do that; and it would have caused a very
> > complicated set of rules about the amount of processor you would need per
> > partition.
> >
> >
> > Al
> >
> > Al Barsa, Jr.
> > Barsa Consulting Group, LLC
> >
> > 400>390
> >
> > "i" comes before "p", "x" and "z"
> > e gads
> >
> > Our system's had more names than Elizabeth Taylor!
> >
> > 914-251-1234
> > 914-251-9406 fax
> >
> > http://www.barsaconsulting.com
> > http://www.taatool.com
> > http://www.as400connection.com
> >
> >
> >
> >                                                                            
> >              Philipp Rusch                                                 
> >              <philipp.rusch@ne                                             
> >              wvision-it.de>                                             To 
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> >                                                                            
> >              01/23/2007 11:14                                      Subject 
> >              AM                        LPAR - micro partitioning an i5-520 
> >                                                                            
> >                                                                            
> >              Please respond to                                             
> >              Midrange Systems                                              
> >                  Technical                                                 
> >                 Discussion                                                 
> >              <midrange-l@midra                                             
> >                  nge.com>                                                  
> >                                                                            
> >                                                                            
> >
> >
> >
> >
> > Hello *ALL,
> > would someone be so kind to explain some LPAR-details to me ?
> > I tried to configure LPARs with Virtual Partition Manager for a quite
> > simple goal:
> > Given a one processor i5-520-machine,  i5-OS V5R3 or V5R4 we want to add
> > one or more Linux partitions.
> > Why is the number of processor units = 0.32 ???
> > Does this mean, I won't be able to give my linux partition a tenth of
> > processor
> > power, because I am not able to divide my 0.32 to something smaller than
> > 0.22 units for my i5-OS partition and 0.10 units for my Linux ?
> > I always thought 0.10 is the minimum for micro partitioning a single POWER5
> > processor and since whe have one processor its processor units have to
> > be 1.00 ??? What am I missing here ?
> > The VPM Redbook is not helpful at all ...
> >
> > Any hint welcome.
> > Regards from Germany,
> > Philipp
> >
> > --
> >   
> >     
> Thanks Al for your fast response,
> but I still don't get it: is my calculation correct or do I have to know 
> something
> miraculous to get the numbers I need ?
> In other words, I can't divide that single POWER5 processor like I thought ?
> What is the math behind that ?
> The Redbook for VPM only talks about a 2 CPU system and gives 1 CPU
> to a secondary partition with Linux, allowing the first LPAR with i5-OS 
> to get
> the whole processor power of 2 CPUs when running in uncapped mode.
> I can't even go to uncapped mode, because my system is "not able" to !
>
> Sigh,
> Philipp
>   
Would I be better off with a model 800, 810 or even a 270, then ?
I never did LPAR config on those, but we need to evaluate this ...
I found the table for "Linux on system i" and I am frustrated:
So at my 520's we have the silly situation that both have the 1200 CPW
processor, which is only able to run 3 partition from its "0.32" CPU,
which means that I am throughing away a lot of CPU-power for my linux
partition, where instead I would need it at my i5-OS partition. Idiotic.
As I learned now, I can only put 0.12 units for i5-OS, 0.10 for the first
Linux partition and another 0.10 units for the second Linux partition
and that's it. How dumb and how inflexible.

Philipp