[Info-vax] How do I assign a disk to a CPU?

Edgar Ulloa ulloa.edgar at gmail.com
Fri Oct 16 23:47:41 EDT 2020


El viernes, 16 de octubre de 2020 a las 11:03:58 UTC-5, Stephen Hoffman escribió:
> On 2020-10-16 04:52:05 +0000, Volker Halle said: 
> 
> > you need to set the preferred_cpu on the fast path port, not the disk 
> > itself. In your case:
> > ... 
> 
> Some more reading on the topic: see the horribly-named Fast Path 
> discussion—and confusingly not the horribly-named Fast I/O 
> discussion—available in Chapter 10 here: 
> http://h30266.www3.hpe.com/odl/axpos/opsys/vmsos84/BA554_90018/BA554_90018.pdf#page317 
> 
> 
> Unless the primary processor is approaching saturated, switching the 
> path is usually of negligible benefit. 
> 
> And if still on HDDs while pondering permuting preferred path, promote 
> pondering SSDs too. FC SAN Storage Controllers are fast, but HDDs are 
> HDDs and slow and there's only so much cache. Though SSDs can or will 
> push the primary processor closer to saturation, given the performance 
> boost. 
> 
> -- 
> Pure Personal Opinion | HoffmanLabs LLC

Stephen

Your participation is very timely, I thank you very much for your attention.

I really thought that using another cpu would have a better performance on the disk that has more io.

Thanks again



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