Quoting Craig Sanders ([email protected]):

> having multiple drive controller technologies - sata and sas, for
> example - is not at all uncommon.

I've already stated my view that this is something to avoid (concerning
main storage) if reasonably possible - and also stated that my view
applies within the scope of the usage scenarios I've found myself in
over the past 21 years of Linux use.  I've also said that I think it's a
great idea to, at minimum, retain UUID-based lines in one's /etc/fstab 
as comments in case the information therein is ever needed.

I believe that covers the matter.

> it's also not at all uncommon for motherboards to have multiple
> different kinds of SATA (or even SAS) ports, requiring different drivers
> - e.g. sata_mv, sata_nv, ahci.

Haven't encountered that, not even in my many years as sole tester of
all proposed new Unix servers, workstations, and laptops for large EDA
firm Cadence Design Systems, Inc.

If I did start encountering such things on my or other systems, on
instance #1 I'd update the /dev/sdX items in fstab and do some very
serious checking to see if this was likely to be a problem (the answer
to which would doubtless be 'yes' except in edge cases like the
transition from drivers/ide to libata for most PATA HBAs in early kernel
2.6, which was a one-time nuisance).  

The fix if necessary, in that hypothetical, might be UUID usage, but
nailing down the module load order might end up being more appealing. 
In that imaginary scenario, I'd have to think about it.

> to the contrary, they're entirely normal and fairly common scenarios.

I don't think that word means what you think it does.  ;->

> the fact that you haven't encountered it just means you're lucky....

Please teach me how to extend that 21-year streak of unfathomably
stupendous luck to other areas of life, Craig.  That would be keen of
you.

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