I thought that Timing Pulses got passed between CEC's on either the CF or Fibre links between the processors. That is why there is Primary Time Server, a Backup Time Server, and an Arbiter. Those 3 CEC's are z9's in my shop. I have a z990 CF processor which has the STP hardware but the SE's have TKNRING.
___________________________________________ Jim Petersen MVS - Lead Systems Engineer Home Depot Technology Center 1300 Park Center Drive, Austin, TX 78753 www.homedepot.com email:[EMAIL PROTECTED] 512-977-2615 direct 210-977-2930 fax 210-859-9887 cell phone -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Kenneth E Tomiak Sent: Saturday, September 20, 2008 10:29 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: A STP question I thought the CECs (pre-STP) would only get time from a Sysplex Timer or a special hardware device that knew how to dial NIST for the time. STP is a replacement for that, so if all 4 CECs play with STP then they need to be able to communicate with one another if only two of them are running the NTP Client. I do not believe the CECs share time to update clocks through other connections. The operating systems running in LPARs use the coupling facility and Fibre connections, not the CECs themselves. The fourth CEC does not have to be part of the 3 CEC STP environment, it can have its own ethernet connectivity to the NTP Server and run its own single CEC NTP Client. Don't all of your z9 and z10 support elements have two ethernet ports? Are you by chance trying to get a non-STP capable CEC to do NTP? I've heard that question often since STP and the NTP Client were releases. The old CECs can only do what the old CECs could do. Several SHARE sessions from a year or two ago covered how to mix STP and Sysplex Timers while migrating towards all STP capable CECs. On Fri, 19 Sep 2008 09:58:33 -0400, Petersen, Jim <[EMAIL PROTECTED]> wrote: >I have 4 CEC's in my shop that are all wired together. The laptops on >3 of the CEC's have a spare Ethernet port. If I don't use the 4th CEC >for the Primary, Backup, or Arbiter, do I really need to connect the 4th >CEC via Ethernet so it can get to NTP? Won't it get its timing pulses >via the Coupling Facility or Fibre connections > > > >___________________________________________ > >Jim Petersen >MVS - Lead Systems Engineer > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
