Alan Altmark wrote:
>Convenience and Security are rarely bedfellows. Hopefully you use a
>different system ID when you're in DR. Use it to qualify the
>OFFLINE/ONLINE_AT_IPL so that you get the correct address range
depending
>whether you are at home or abroad.
I've seen a number of posts, either here or on IBMVM, that suggest
changing system ID's for DR. We don't do that. We have 18 VM systems.
They're all somewhat different, or we wouldn't have that many. There is
far too much node-dependent code to introduce additional node names for
DR. If the code all belonged to the systems area, we might be able to
manage it, but some of it is application code. E.g.
Select
When Wordpos(node,'NODE1 NODE2 NODEA NODEC') > 0
Then Do ...
When node = 'NODE4'
Then Do ...
etc
There are valid reasons for this type of code. Differences in the tape
or DR environments, for example. These are hardware decisions over
which we have no control. I can just imagine the havoc changing node
names would have caused when we had OfficeVision. In the interest of
making the DR environment look as much like production as possible for
our users, we chose to keep the DR node names the same. That decision
was made many years ago, and processes developed around it. Changing it
now is off the table. Even if we just starting to design DR, I don't
know if I'd go for changing node names.
I know this is the Linux list. In a pure guest environment, this might
be less of an issue. Some of our nodes have a CMS workload, where the
VM node name definitely matters.
Dennis O'Brien
39,650
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