On Tue, Nov 11, 2008 at 2:25 PM, Staller, Allan <[EMAIL PROTECTED]> wrote: > IANA IBM'er. However, I have been looking extensively into > virtualization as a means to save my company some serious GREEN dollars, > not funny money and not eco-dollars.
While you can (and will!) save GREEN dollars (I know at least one company doing a lot of that), don't overlook the potential systems manglement savings. This must be intentional or it won't happen. There is also a thread in this group about read-only root. Read-only root is one example of resource sharing, and that's where virtualization really wins. The more alike you can keep your flock o penguins the easier they are to hatch, groom, and cull. You are correct that VMware does not run on the z. VMware, like z/VM, is a true hypervisor in that the "guest" executes on the underlying physical processor until there is some exception (such as I/O or a privileged operation). It is that run-on-the-bare-metal feature which gives z/VM and VMware such low insertion loss compared to emulators (eg: BOCHS). But it is that same run-on-the-bare-metal feature which binds z/VM to the mainframe and binds VMware to the INTeL instruction set. The Mantissa product z/VOS (for Windows on z/VM, and they do mean INTeL executables) is an emulator. They believe they have addressed performance issues enough to make it viable. It is also true that the latest mainframes have ample CPU power and need not shy away from emulation like most of us recommended in the past. I hope this helps. -- Rick; <>< ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
