On Mar 11, 2008, at 6:59 AM, Karl Kingston wrote:
Thanks for the responses to my DR question. Helpful information!
So basically, I have 2 methods of bringing z/VM up at our DR site:
1) Run it under the z/VM Floor System (we use Sungard as our DR
service).
2) Bring z/VM up in an LPAR.
To me, option one is probably the BEST and EASIEST to implement as I
don't have to make changes to our running system to be able to run
at the DR site.
So: If I bring z/VM up under z/VM, what's the performance aspects
of it? Will it affect performance more than if z/vm was running in
an LPAR?
You'll take a few percent hit, versus identical hardware, but the
larger difference is going to be the difference in hardware and load
on the machine at the DR site.
But seriously, being a VM user and *not* using a virtualized second-
level system for recovery is...silly.
It's a *DISASTER* you're talking about. Getting the system back up--
even running slower--is most of what counts. You can recreate a
faithful copy of your environment very, very easily using VM, and it's
very, very much harder on the metal. DR procedures should be as
simple as possible, because people are panicky during a disaster and
there shouldn't be much that CAN go wrong. In that case, VM and an
identical (even if second-level) environment is a clear win.
Adam
