[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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