Messages in this thread | | | Date | Thu, 24 Jun 1999 11:44:02 +0200 | From | Ralf Baechle <> | Subject | Re: SMP Question. |
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On Wed, Jun 23, 1999 at 06:56:26PM -0400, Wakko Warner wrote:
> I thought it would be nice if you could actually take a cpu offline like a > sun sparc can. I have a dual supersparc 50mhz running linux. Be nice to > beable to offline a cpu, upgrade it and put it back online w/o loosing your > uptime =) AFAIK, solaris can do this (offlining a cpu), I don't know about > hot plugging a cpu. A friend of mine said it was doable.
That works well on some Sun hardware. It however can only work where it is explicitly supported by hardware and most hardware, doesn't.
It's different if a CPU module fails in flight or is offlined administratively. If it does and the failure is just right then there is little that can be done to protect the entire partition from crashing. So hot plugging capability doesn't give you a silver bullet against damaged CPUs. It's different with hardware that is designed to be fault tolerant like Tandem's.
Ralf
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