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  3. July 2002

RE: disk arms (was RE: Tips for user ASP)

-----Original Message-----
From: midrange-l-admin@midrange.com
[mailto:midrange-l-admin@midrange.com]On Behalf Of vhamberg@attbi.com

>Isn't cache about saving frequently-used data? Writing
>to cache is going to add cycles to the process, in order
>to get benefit in other places (which I don't know about
>yet).

Vernon,

I think it is the opposite. Where reads are concerned, I would guess that
the entire main store memory is a cache.  It is on the write side of the io
operation that disk cache can provide its function, that is as a non
volatile ( permanent ) place to store the dasd data. ( theoretically, the
entire "disk" could be non volatile ( bubble ) memory ).

Steve

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