Ok.. So how many people leave their "l am down to one SE z machine" powered down for lengthy periods of time that is not a DR machine? Or is running production on a single SE machine for a long time using STP?
I am hoping that my questions are somewhat rhetorical or humorous and completely lacking in the "Homer Simpson duooh!!" head slap. It would be like running an older multi-CEC sysplex with a single ETR expecting no single point of failure. Rob Schramm On Tue, Apr 19, 2016, 5:06 AM linda golding <[email protected]> wrote: > Am curious . This is what i could find looking at the enhancements . Since > you say STP doesn't steer the clock , i would like to know how this works > these days . > > *http://www-03.ibm.com/systems/z/advantages/pso/stp/ntp.html > <http://www-03.ibm.com/systems/z/advantages/pso/stp/ntp.html>* > > > *Service Element (SE) Time Accuracy* > As a continuation of the zEnterprise 196 (z196) timing accuracy > improvements for an STP-only CTN, namely, SE/CPC hourly clock steer and > synch, the zEnterprise EC12 and zEnterprise BC12 have expanded these > enhancements by allowing the SE to access an STP panel-configured External > Time Source (ETS), even when the CPC is powered off or has not been IMLed. > The SE achieves this by invoking the ETS-configured NTP servers to obtain > the ETS-SE time difference and steers the SE clock towards the ETS clock. > During IML, the more accurate SE clock time transfers to the CPC clock, > maximizing the CPC timing accuracy. > > This feature is available exclusively on zEnterprise EC12 and zEnterprise > BC12. > > Thanks , > > Linda > > > > > > > > On Tue, Apr 19, 2016 at 1:57 PM, R.S. <[email protected]> > wrote: > > > W dniu 2016-04-18 o 23:19, linda golding pisze: > > > >> One of two SE failed means you can peform everything you want, including > >> STP. Maybe STP setup would be impossible (I haven't checked), but I'd > bet > >> it is also possible. > >> I've been working with single SE (primary failed) for some time. It > wasn't > >> my dream, but I could live with it. >>>> > >> > >> > >> I thought STP code runs on the support element . Access to the NTP > server > >> from the CTS is initiated and controlled by the Support Element. > >> > >> In that case , a sysplex would die when support element is not > available . > >> > > NTP is not STP. > > STP is managed from HMC/SE but it doesn't mean the SE is steering the > > clock. > > NTP can be used for "wall clock" time adjustment, but STP will work > > without NTP at all or with NTP failure. > > Last, but not least: multi-CPC STP configuration will survive any of the > > CPC failure. 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