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

[Stephen Hoffman]

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.

-- 
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