I agree, but the question that my management team has requested for me
to find out is whether we can use another mechanism to sync the time
across the three CEC's without STP or ETR.
Mark Jacobs
On 02/06/14 10:38, Skip Robinson wrote:
I believe that the STP-to-9037 scenario was envisioned as an emergency
fallback option, not an upgrade (or rather downgrade) procedure. The
kicker is that your z10 does not have the STP feature now, but the z10 is
no longer upgradable. The only possibility I see is to acquire a different
CEC, either a comparable z10 that already has STP or an affordable z196 or
even z114.
Bean counters become myopic from studying beans too closely.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
jo.skip.robin...@sce.com
From: Mark Jacobs <mark.jac...@custserv.com>
To: IBM-MAIN@LISTSERV.UA.EDU,
Date: 02/06/2014 06:15 AM
Subject: Re: Sysplex Common Time Source
Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU>
You've hit the problem, we have two z196 processors that are STP
capable, but can't have the 9037's attached, and one z10 where we can
attach the sysplex timers, but that processor doesn't have the STP
feature.
Mark Jacobs
On 02/06/14 09:05, Dana Mitchell wrote:
On 02/06/14 06:38, Scott Chapman wrote:
I believe that you can have a mixed CTN where one CEC doesn't have
STP, but in that case the external time source must be
the 9037 and I'm pretty sure that at least one of the CECs must be both
STP and 9037 capable. I don't know what the implications > are from
converting from a pure STP environment back to a mixed environment, but it
seems like when we did the conversion to > STP there was some sort of
fall-back provision.
The STP Implementation Guide Redbook SG24-7281 describes migrating from
STP-only CTN to Mixed CTN. They add this caution:
A migration from STP-only to Mixed CTN may take considerable time due to
the potential
difference in time between the Current Time Server and the Sysplex
Timer, at the start of the
migration. Once the migration is selected, the STP facility will need to
steer the Coordinated
Server Time (CST) towards the time being provided by the Sysplex Timer.
On Thu, 6 Feb 2014 07:27:15 -0500, Mark Jacobs
<mark.jac...@custserv.com> wrote:
That was what we originally though too, but our local IBM support
person
told us we couldn't. Thinking further about configuration activities to
migrate to mixed CTN mode, I'm not seeing how on the non STP capable
processor we're going to be able to set the name of the mixed CTN,
since
it isn't going to have the STP tab for that CEC,
In a mixed CTN, one or more CECs can be only attached to the 9037's and
not even required to be STP capable. There must be at least one CEC that
is STP capable and attached to 9037's.
Dana
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Mark Jacobs
Time Customer Service
Tampa, FL
----
The quiet ones are the ones that change the universe...
The loud ones only take the credit.
Londo Mollari - Babylon 5
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