Re: Microsoft .NET frontending IBM i

Better re-read that Nathan..

Or like the i 6.1 and i 7.1 operating systems can only span 32 cores
and 128 threads, and for i 7.1 running on Power7 iron, a special PRPQ
will only let it span 64 cores and 256 threads. That is, at best, one
quarter of a Power 795 for the i operating system and its integrated
database. I have complained to the IBM top brass in the Power Systems
division about these shortcomings on your behalf, for whatever that is
worth.

AIX has some threading issues, too. On the Power 795, you are limited
to 32 cores and 128 threads for dynamic logical partitions at the
hardware level (that's one processor book and that makes it a hardware
partition of sorts) unless you get feature 1256, which allows dynamic
LPARs to scale up to the full 256 cores of the Power 795 system. IBM
is not charging for feature 1256, but the fact that it has a separate
feature for this scalability implies that Big Blue is keeping its
options open. It is not clear if i 7.1 needs feature 1256 or an analog
to jump from 32 cores per partition up to 64 cores in that PRPQ.

So to summarize:
IBM i - nominal max of 32 cores , PPRQ available to up that max to 64 cores
IBM AIX - nominal max of 32 cores , feature 1256 available to up that
max to 256 cores

Here's another link with a nice chart
http://www.itjungle.com/tfh/tfh022210-story02.html


Charles



On Mon, Oct 11, 2010 at 2:19 PM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:

IBM i can now scale to 256 cores without partitioning.

Oh, no it can't...

"unless you get feature 1256..."
On the Power 795, you are limited to 32 cores and 128 threads for dynamic
logical partitions at the hardware level (that's one processor book and that
makes it a hardware partition of sorts) unless you get feature 1256, which
allows dynamic LPARs to scale up to the full 256 cores of the Power 795 system.

http://www.itjungle.com/tfh/tfh082310-story03.html


-Nathan



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