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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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scott wrote:
>> What do you mean non-standard? Every single bank, every single
>> insurance company, every single government tax agency/ministry/dept.,
>> most airline, universities, and large companies with more than a 1000
>> employees worldwide has one or more IBM mainframes.
>
> And they also have 1000 or more x86 machines each :-)
Almost all of which do nothing except run a web browser open to the back end
site running on the mainframe.
--
Darren New, San Diego CA, USA (PST)
C# - a language whose greatest drawback
is that its best implementation comes
from a company that doesn't hate Microsoft.
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scott wrote:
> 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.
Yes. They have ACID. They're actually charging money, and allocating
resources like airplane seats, in ways that you actually need to coordinate
different requests. Google doesn't, but google also serves an audience in a
way that physically putting the machines closer to the audience helps business.
--
Darren New, San Diego CA, USA (PST)
C# - a language whose greatest drawback
is that its best implementation comes
from a company that doesn't hate Microsoft.
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