IIRC the trigger for this thread was the suggestion that
primarycache=none be set on datasets used for swap.
Presumably swap only gets used when memory is low or
exhausted, so it would it be correct to say that it wouldn't
make any sense for swap to be in /any/ cache? If this isn't
what primarycache=none means, shouldn't there be a
disable-cache-entirely flag for datasets used for swap?
I guess reads from swap must be buffered somewhere, so
it would be an optimization to have such reads buffered
in a read cache. But wouldn't the read cache be real small
at this point? It's enough to make your head spin :-)
-- Frank
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