>>> On 11/12/2008 at 4:42 AM, "R.S." <[EMAIL PROTECTED]> wrote: > Tommy Tsui wrote: >> I have a question on z/VM. I understood z/Linux running on z/VM but why we >> need z/OS running on z/VM?...becuase of sharing resource? any shop running >> z/os on z/VM? > > You don't need to run z/OS on VM. This is an option, IMHO rarely used in > "serious" production.
Some people do, but it's far more common to see test/development systems running as guests. > Resource sharing? Well, I don't think so. Usually VM is used only as > hypervisor for Linux (VSE, z/OS), it rarely has data to share. Data isn't the only resource to be shared. Memory and CPU are equally important. To me, the biggest advantage of z/VM over LPARs in terms of resource sharing is that memory is allocated and used dynamically, not statically. Being able to fire up a new guest z/OS or z/VM or Linux, without having to do any work at the HMC, without having to have allocated reserved LPARs in advance, etc. is really, really nice. Other features, such as dynamically creating/destroying LANs and NICs and so on are why I've always called z/VM a "systems programmer's operating system." It just makes your life so much easier. Mark Post ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
