RE: LPAR on very small machines

To my knowledge, and please correct me if I'm wrong here, each LPAR
requires at minimum a bus, load source disk and associated controller,
and optical drive.  Although one would think with image catalogs the
optical drive would be optional once the initial install is done (and it
may well be - I don't know). 

On small systems the bus is the killer as i5 CECs have, I believe, a
single bus (until you get to the 5+ CPU 570s).  Thus you'd be forced to
get an I/O rack (5088/0588, 5x94, 5095/0595) to get more buses to
support the LPARs.

And, for the original poster's question, i5 systems support V5R3 and up.
I don't think you'd be able to install V4R5 at all as it's microcode
wouldn't recognize the new hardware.

John A. Jones
Americas Security Officer
Jones Lang LaSalle, Inc.
V: +1-630-455-2787 F: +1-312-601-1782
John.Jones@xxxxxxxxxxxxxxxxxxxxxxx

-----Original Message-----
From: Pat Barber [mailto:mboceanside@xxxxxxxxxxxxxxxx] 
Sent: Wednesday, August 18, 2004 10:04 AM
To: Midrange Systems Technical Discussion
Subject: Re: LPAR on very small machines

That sounds like building two machines.

I have assumed for a long while that LPAR required a "great deal" of
planning to make it work. I often wondered about this after seeing the
chart that shows up to 256 partitions on a single machine. That's gonna
require a few extra parts.


Vern Hamberg wrote:

> You can do partitions on a small machine - they'll just be very small 
> partitions. The issue, IIRC, has more to do with the peripherals. You 
> need duplicates of some devices, like CDs, you probably need an extra 
> tower for various cards where you can attach external tape drives - 
> not recommended on production machines, BTW, but I've hot-switched a 
> 3490 between LPARs in the lab at IBM. It's no small task to retrofit a

> machine for LPARs.


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