up to mp...

[Chapter11]

I have a uniprocessor rs6k running AIX 4.3.3 with the TCB installed.

That machine is about to get some CPUs added to it. Will I need to reinstall the OS, or will cfgmgr -i be able to cope with changing out the kernel?

 

[Chapter11]

turns out you need to do exactly nothing, except reboot the machine once more after bosbooting your boot drive(s). AIX automatically switched from the up kernel to the mp kernel.

 

[Morsing]

Hmmm... Shouldn't AIX run the MP kernel even when you only had one CPU??
The kernel chosen depends on the architecture not the number of CPUs. And what would a bosboot do??

Cheers Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support

 

[jprabaker]

Uniprocessor machines use the uniprocessor kernel not the mutliprocessor kernel?.

The bosboot command is needed to re-create the boot image with the mp kernel.

 

[Morsing]

Yes, but you're misunderstanding what a uniprocessor machine is.

Computers like the B50, 43P-150 and so on, are uniprocessor machines which no chance of ever being a multiprocessor machine.

Multiprocessor machines are always multiprocessor machines no matter the actual number of processors, even if it only has one.

If you need to run bosboot to change the kernel you've been running from UP to MP, there's something seriously wrong and I doubt that it has ever run anywhere.

Cheers Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support

 

[Chapter11]

I just upgraded an H50 from 1 CPU to 3 CPUs. Before the upgrade, /unix was linked to the uniprocessor kernel, not the multiprocessor kernel.

 

[Morsing]

I once made two image install CD to use for reinstalling a system. One was made with an bos.up, one with a bos.mp.

Worked fine on several uni- and multiprocessor computers until I tried it on a 620 with one processor. That was a no go. But the multiprocessor CD worked.
Asked a colleague and an IBM guy about it and they confirmed it.

Can't test it anymore because I haven't got any uniprocessor computers (I think).

Cheers Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support