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> Mainframes do way more than overnight batch jobs. A typical mainframe
> environment will allow for 99.999% uptime. Handle millions of
> transactions per day with response times below 5 secs. A similar
> environment made out of x86 or x64 hardware, with the required redundancy,
> clustering and load-balancers required to achieve five-9s uptime (That's
> less than 25 secs of downtime PER MONTH!) as well has handle the number of
> transactions at the same speed will probably be as expensive, if not more.
Oh ok, that's all I wondered. I guess they have different requirements than
eg Google that decided to take the lots-of-cheap-x86s path.
> That's the main reason banks and airlines (the two industries I'm familiar
> with) don't change their systems.
Yeh, and if there was some advantage to x86 sytems, it would probably have
to be quite a large gap to make it worthwhile changing over (which surely
won't be cheap).
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