Re: Mainframe Applications and Records Keeping?

John S. Giltner, Jr. wrote:
[...]
Mostly Linux on the MF was so that you could migrate what was on 10, 20, 200 Intel boxes that were sitting there 90% idle and put on a single box and share CPU and Memeory resources.

IMHO this is marketing mantra from IBM.
1. Sharing memory resource is not true. Memory can be easily reconfigured (taken from system A to system B), but, assuming 24x7 availability it is big advantage.
2. Usually all the servers have workload peak in the same time. They usually form single information system.
3. Even If sharing resources could make some savings in term of megabutes or CPU cycles, it doesn't necessarily mean any savings in costs. CPU cycles and megabytes in PCs are much cheaper. Maybe cycles are hard to compare, but memory price is simple to compare - megabyte has the same meaning.
4. There is also not mentione advantage of Linux on z/machine: hardware reliability and availability. It is hardly comparable, the only thing in replace of RAS could be hot reserve or clustering.

--
Radoslaw Skorupka
Lodz, Poland

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