June 2003
Intermediate to advanced
464 pages
10h 33m
English
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2.4. From real to virtual
“Virtual” is a word used by other manufacturers today. Virtual on one machine is not the same as on other machines. On the mainframe it is not only the memory that can be virtualized. On the mainframe, virtualization has been part of the design for over 30 years. It is the key factor that allows you to do consolidation on the mainframe. For more details on virtualization, see Chapter 7, “The Value of Virtualization.”
2.4.1. The roots of z/VM
In the 1960s, hardware was expensive, and it was imperative to use a computer as economically as possible, that is, to run it as much of the time as possible. The machine was needed to run existing business applications, and also to test new programs. Ideally, each tester needed ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.