On Jul 20, 2005, at 4:54 AM, R.S. wrote:
---------------------SNIP-----------------
I can see small one: nobody uses other geometry than 3390 (please,
let's forget 3380 and older stuff, I'm talking about life
datacenters, not musea).
z/OS does not support devices with 64k heads or 16M B/trk. DASD
manufacturers also does not offer such emulation.
This is capacity limitation problem.
This problem can be solved by IBM. They can do anything they decide:
- provide new geometry
- more cylinders, despite of word/halfword considerations
- more heads, longer tracks
- use 'reserved' fields in CCW
- make revolution - FBA support
- or even something completely new (linear storage)
- or drop mainframe business
- or just let it die by not changing anything.
ANd they can provide JOBCAT/STEPCAT support for UCB's over the 16 meg
line.
Ed
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