Re: IOPless machines and multiple CPUs

[Roberto José Etcheverry Romero <yggdrasil.raiker@xxxxxxxxx>]

Configuring an LPAR with more cores than licensed ends up with a message
saying that you are over entitlement but it still uses those cores.
One of the reasons I don't understand i hosting i is the economics of the
exercise. It is a lot more expensive to use IBM i to virtualize
storage/network than the almost free VIOS.
On a big machine you might need more than 2 entire cores for IO and that
gets expensive quickly.

Roberto

On Sun, 26 Jul 2020, 12:39 Patrik Schindler, <poc@xxxxxxxxxx> wrote:

> Hello,
>
> imagine a newer POWER machine with, say, four CPUs. IBM i is licensed to
> one CPU, so I guess when you give the LPAR more than one, it won't be used
> for running "normal" code. Right?
>
> Does anybody know (and provide evidence) if a second assigned CPU will be
> used as "helper CPU" for I/O? Not exactly an IOP, since this involves
> drivers and other stuff. My thinking stems from the z-world where
> processors can be freely configured to specialized tasks (I/O, running
> Linux, running Java, …). The number of CPUs often influences licensing
> cost, which probably was one of the reasons to invent this feature in the
> first place.
>
> Thanks!
>
> :wq! PoC
>
> PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc
>
>
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