On Thursday, 05/28/2015 at 06:50 EDT, Mike Walter <[email protected]>
wrote:
> That post was written before Linux ran on any IBM mainframes, and it
addresses
> some CMS application issues, but some parts (e.g. 'other systems', and
> accumulated changes affecting the next IPL) still apply. While you're
there,
> search for other posts on that thread... interesting and enlightening
reading.
So I think what has been made clear is that the only thing "necessary" is
to die. All else is up to you. If you re-IPL, know WHY you are doing so.
"Because Dad says so," isn't good enough any more. It was fine back in
Dad's day, but things are different now. Is it for
Security patches?
Proactive maintenance?
Configuration changes that can't be put into effect dynamically?
Validation that your change control process is working properly?
Just to remember how?
As a demonstration of your power over the virtual machines ("Never let the
inmates run the prison.")?
In the Golden Age of CMS, it was simple to shut down and restart. A few
servers needed to be brought down nicely, but end users could be crushed
with impunity ("shutting down in 2 minutes...please logoff NOW" was
sufficient.) Today we have a different set of concerns to think about
with Linux. Not only do we worry about less-tolerant file systems, we
have more database managers and applications that like an orderly
shutdown.
If you are encountering z/VM operational errors that can be fixed only by
IPLing, then I expect you have a PMR open. :-)
Alan Altmark
Senior Managing z/VM and Linux Consultant
Lab Services System z Delivery Practice
IBM Systems & Technology Group
ibm.com/systems/services/labservices
office: 607.429.3323
mobile; 607.321.7556
[email protected]
IBM Endicott
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