Mark Post wrote:
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.
There is no difference between us. Maybe I din't stated my opinion
clearly enough <g>
VM is good for HW resource sharing, or rather managing. Usually there
are no *software resources* (datasets, files, databases) to share
between VM and z/OS. Otherwise on could ask why z/OS *under* VM, why not
z/OS in LPAR-A and VM in LPAR-B.
BTW: Does anyone use VM and no other OS under it ?
I'm aware of single installation in Poland (they gone AFAIK).
--
Radoslaw Skorupka
Lodz, Poland
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