Jim's process is solid. On the z/VSE web site there is a page that
describes what needs to be done during the twice yearly time change
(forward and backward). Of course, now I can't find it, apparently it's
buried.
In a nutshell, after the timezone is set in z/VM, z/VSE can get the new
offset with the AR command TIME ZONE=VM. The CICS 'CEMT PERFORM RESET'
commands will reset CICS's clock to the new OS time. Any other clock
sensitive running jobs will need to be restarted as they will have the
old clock setting. The one hour wait is only required in the fall, in
the spring everything can continue as normal. An IPL is not required.
I have customers that do not IPL for time changes and haven't for many,
many years.
Kris Buelens wrote:
For VSE, what I learned: from the ASIPROC
remove SET DATE
remove SET ZONE
remove SET ZONEDEF
remove SET ZONEBDY
Then VSE would take the definitions of the VM system under which it is
running. You still need to reIPL the VSE guests when the timezone
changes.
For VMUTIL:no problems to expect. A bit simplified: a z Series has no
timer to tell "wake me up at hh:mm:ss"; Wakeup allows hh:mm:ss. The z
Series has "wake me up in xxxx seconds". So VMUTIL converts the next
coming hh:mm:ss it finds in its WAKEUP file into wakup up in xyz
seconds. If the timezone changes in the mean time, VMUTIL won't see
that. But, when the xyz seconds have elapsed, it'll wake up, execute
what was wanted and scan its wakeup file again for anything that is
either late (and wakeup directly) or the first coming event and set
the xxx seconds timer again. etc
2009/10/13 David L. Craig <d...@radix.net <mailto:d...@radix.net>>
On Tue, Oct 13, 2009 at 08:35:01AM -0500, Frank M. Ramaekers wrote:
> How do you accomplish this change? (Especially with guests
O/S's, like
> VSE, and timing related service machines, like VMUTIL).
I come into the Data Center, bring down our VSE/ESA 1.7
and 2.2 virtual machines, SET TIMEZONE EST, and autolog
the VSE machines back on. Some shops wait an hour but
that hasn't caused us any problems.
--
May the LORD God bless you exceedingly abundantly!
Dave Craig
- - - - - - - - - - - - - - - - - - - -
"'So the universe is not quite as you thought it was.
You'd better rearrange your beliefs, then.
Because you certainly can't rearrange the universe.'"
--from _Nightfall_ by Asimov/Silverberg
--
Kris Buelens,
IBM Belgium, VM customer support
--
Rich Smrcina
Phone: 414-491-6001
http://www.linkedin.com/in/richsmrcina
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