Re: IOPless machines and multiple CPUs

True, VIOS come with PowerVM, and is about the same cost per core as VMWare, or less.

That’s the software. Now get the fiber And Ethernet switches to support the virtual environment and the cost goes up dramatically, so does the complexity.

For true production workloads that have any sensitivity to I/O, or the performance is critical, then VIOS is the way to go. Many IBM i workloads are just fine with IBM i hosting, and that’s far less complex, simple to set up, and easy to maintain.



Jim Oberholtzer
Agile Technology Architects

On Jul 26, 2020, at 12:01 PM, Roberto José Etcheverry Romero <yggdrasil.raiker@xxxxxxxxx> wrote:

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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