If the LPARS are not all on one box, it is the case that there is one
charge based on the total number of engines. The same applies to running
as guests of VM. As long as you stay within the footprint of the machine
for which you bought the license, you can run multiple copies because
you have licensed according too the total capacity.
One point mentioned by Peter Webb, but maybe not emphasized enough, is
that the hardware costs may be considerably lower if you can virtualized
resources. For example, if you need to connect the guests using CTCAs,.
you can define VCTCAs. Similarly, you may be able to save on OSA cards
by using VSWITCH. Then there are things like minidisks and the ability
to use the same memory for more than one guest. With LPARs, the storage
needed for the z/OS or other system has to sit idle if the LPAR is not
up and running. Even with z/VM 5.4 on a z10, you cannot take storage
away from a running guest. You have do deactivate the LPAR and
reconfigure its image to do that. (Alan, If Reed doesn't monitor the
list, please tell him I brought it up again. Try to embarrass me, will
he?)
Boy does VM/BSEPP churn up memories. Today, the CP overhead is way
smaller than it was in those days, so look at more modern systems before
making any decision based on overhead. Running lots of LPARs has its
overhead, too. The difference might not be as bad as you think.
Regards,
Richard Schuh
________________________________
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of Ward, Mike S
Sent: Wednesday, August 27, 2008 3:08 PM
To: [email protected]
Subject: Re: Lpar Vs VM
Thanks for the reply. Yours seems to be the best so far. I
wanted to try and figure the cost of setting up multiple z/OS machines
in a fairly quick manner.
As I remember the old VM/BSEPP you could run as many operating
systems as you wanted under VM and be charged for only 1 copy of the
operating system. That doesn't seem to be the case using LPAR's . It
seems that we get billed for running z/os on Lpar 1 and Lpar 2. They
gather the amount from the SMF records that are produced. That's why I
was wondering if I would get billed for multiple z/os virtual machines
under z/VM.
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, August 27, 2008 12:49 PM
To: [email protected]
Subject: Re: Lpar Vs VM
I can't speak to z/OS software charges, but for VSE, we pay for
only one license for multiple instances running under z/VM. And we pay
the VSE license for the total capacity of the machine.
I don't think you can say that VM is better than LPAR as a
general statement. In some cases VM definitely is better, and in others,
LPAR is the winner.
Do you need to create new z/OS instances on short notice for a
brief testing period? z/VM is a clear winner.
Do you need every last CPU cycle for your production z/OS? LPAR
is better here.
Do you need to frequently shift resources around between your
LPARs? z/VM might make your life easier.
Is your hardware environment fairly static? Could be better to
stay with LPARs.
Are you thinking of running Linux on your mainframe? You will
almost certainly want to run z/VM then.
z/VM brings you unmatched flexibility, but at a cost of some CPU
cycles and money. If you have large numbers of LPARs though, it can
reduce the complexity of your configuration, and allow better sharing of
your resources.
Perhaps if you expand on what you hope to achieve, we can
provide more targeted responses.
Peter
-----Original Message-----
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of Ward, Mike S
Sent: August 27, 2008 11:31
To: [email protected]
Subject: Lpar Vs VM
Hello all, I have a question. When we set up and lpar with an
operating environment such as MVS, we get software charges for both
lpars from IBM. Third party vendors don't seem to care if it's on the
same machine (Most don't) since they charge for the full mip rate of the
machine regardless of whether it's utilized or not. Long ago, about 30
years I had a VM shop and we ran multiple instances of OS/VS1, MVS, etc,
but were only charged for on license of software product. Is this still
the case? Is it better to use VM instead of LPAR? All comments
appreciated.
Thanks.
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