We - mainframe users - are using mainframes for eg. because of 99.9%
uptime. Do everyone have a 2nd one as a disaster recovery system - or we
just put everything in one basket? As Murphy said...
Often, yes. I'd say most people have either a) a sysplex or b) a hot site.
Also, comparing traditional zSeries operating systems to the Unix world is
comparing pears to cactus.
I understand what you mean, I can imagine a complex system where this can
be a big problem. I was thinking in a lots of users and not so high number
of services.
That's one of those tradeoff situations. Large interactive hosts are fairly
rare these days.
Yes, not screamingly fast, but reasonable, and how many
applications *really* need 3 Ghz CPUs for anything but bragging rights?
If
your application *really* needs that kind of horsepower, you're on the
wrong
system anyway -- you need big Intel or PPC engines, not zSeries.
for eg. SAP has no limits when we are talking about HW needs :), but we
need the no downtime feature of the z/Series. The company has here
mainframes since the punch card times, MVS production apps designed to run
in this environment. Since that times Intel grew up, (and to tell the
truth, many mission critical apps are running happily on such machines
too, maybe more than on mainframes), new application developers do not
care about cpu cycles, but at the end, the user wants short response time.
Thanks to the java simple stupid apps will need more and more cpu.
Yes, that's one of the few cases (SAP) that actually makes some sense to use
an LPAR. But, that application is tightly bound to zSeries features, and
actually knows how to exploit the HW features. I won't get started on the
Java thing... my blood pressure is high enough... 8-).
This is true only in the happy west side of the world, here just the
maintenance costs of a z/VM is a good salary..
It's rapidly becoming the same here...8-(
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