Re: Processor Confusion

Old IBM i machines like the P5s were licensed by CPW and not cores (not
exactly true, but close enough to explain this). 500 to 6000 CPW versions
were available and, depending on which one was bought, would mean how many
"Cores" you see on the HMC.
To be fair, the kind of machine where you have only 0.43 cores available is
not the kind of machine you will be doing Micro Partitioning on and might
not even have the feature.
Newer machines are always licensed by core and when IBM wants to make a
"low powered" edition box they just turn off the cores in the hardware (I
think they might be using the worst-yield 4-cores and disabling 3 of them)

Best Regards
Roberto

On Wed, Aug 19, 2020 at 7:30 AM Patrik Schindler <poc@xxxxxxxxxx> wrote:

Hello Chris,

Am 19.08.2020 um 09:48 schrieb Christopher J. Wager | 56K Projects <
cwager@xxxxxxxxxxxxxxx>:

When i look at the details of my Power5 Box's Processor information

using the HMC,

it says:

Configurable: 0.43

Installed: 1.0

I am a bit confused by this if the installed is 1.0 why can only 0.43 be

configured.

This depends on your already configured LPARs.

First, there's a difference between physical and logical cores assigned to
an LPAR. I never cared to understand the need for logical cores.

If you CPU is assigned to a CPU pool, you can assign fractions of a Core
to a VM. All the fractions of running LPARs must sum up to less-equal the
available Core count.

Hint: If you tick the "uncapped" checkbox, LPARs may take more than their
configured fraction, if enough CPU cycles are available. Maybe this is
where logical CPUs come into play.

Does that help a bit with basic understanding?

:wq! PoC

PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc


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