W dniu 2011-03-25 17:16, Bill Fairchild pisze:
If z/OS now supports 4TB of central storage, then IBM has presumably tested it
somewhere. Which means it's possible to have 4TB really there.
Well... No.
I remember Novell Netware v3 or v4. It was 32-bit OS, so Novell claimed
it support up to 4GB RAM. In 1990 (premiere of 3.x) there was no 386
machine supporting so much memory. I would say more: there were NEVER
386 machine commercially available with 4GB of RAM.
However around 1999 Novell ...changed official information - they
supported "only" 3,25GB. Possible reason: they finally did the tests and
found some limitation.
In z/OS there is some barrier which is set by designers at 4TB. So, they
are sure of the limitation, because they did set it. And there is no
other KNOWN limitation.
BTW: To Tom - yes, z196 supports up to 3TB, but AFAIK single LPAR is
able to support up to 1TB (as in z10).
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