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IBM Z Server Time Protocol Guide

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IBM Z Server Time Protocol Guide Front cover Draft Document for Review August 3, 2020 1:37 pm SG24-8480-00 IBM Z Server Time Protocol Guide Octavian Lascu Franco Pinto Gatto Gobehi Hans-Peter Eckam Jeremy Koch Martin Söllig Sebastian Zimmermann Steve Guendert Redbooks Draft Document for Review August 3, 2020 7:26 pm 8480edno.fm IBM Redbooks IBM Z Server Time Protocol Guide August 2020 SG24-8480-00 8480edno.fm Draft Document for Review August 3, 2020 7:26 pm Note: Before using this information and the product it supports, read the information in “Notices” on page vii. First Edition (August 2020) This edition applies to IBM Server Time Protocol for IBM Z and covers IBM z15, IBM z14, and IBM z13 server generations. This document was created or updated on August 3, 2020. © Copyright International Business Machines Corporation 2020. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Draft Document for Review August 3, 2020 8:32 pm 8480TOC.fm Contents Notices . vii Trademarks . viii Preface . ix Authors. ix Comments welcome. .x Stay connected to IBM Redbooks . xi Chapter 1. Introduction to Server Time Protocol . 1 1.1 Introduction to time synchronization . 2 1.1.1 Insertion of leap seconds . 2 1.1.2 Time-of-Day (TOD) Clock . 3 1.1.3 Industry requirements . 4 1.1.4 Time synchronization in a Parallel Sysplex. 6 1.2 Overview of Server Time Protocol (STP) . 7 1.3 STP concepts and terminology . 9 1.3.1 STP facility . 9 1.3.2 TOD clock synchronization . 10 1.3.3 STP Servers . 11 1.3.4 STP Stratum levels . 12 1.3.5 Server roles in a CTN . 14 1.4 Coordinated Timing Network. 15 1.4.1 CTN ID . 15 1.5 Coupling Links. 16 1.6 External Time Source . 18 1.7 Firmware implementation . 19 Chapter 2. Planning hardware and software . 21 2.1 Planning server hardware . 22 2.1.1 Servers . 22 2.1.2 Hardware Management Console . 23 2.1.3 Support Elements -- Connectivity to ETS . 26 2.2 Planning connectivity . 27 2.2.1 Planning for coupling links for STP . 27 2.2.2 Planning for timing-only links . 32 2.2.3 Considerations for multi-site sysplex. 34 2.3 External time source . 35 2.3.1 Precision Time Protocol grandmaster. 35 2.3.2 NTP server . 36 2.3.3 NTP server with pulse per second . 42 2.4 Internal Battery Feature (IBF) . 46 2.5 Planning z/OS software. 47 2.5.1 z/OS requirements for STP. 47 2.5.2 CLOCKxx . 48 2.6 Planning for z/VM, z/TPF and Linux on IBM Z . 53 2.6.1 z/VM . 53 2.6.2 z/TPF . 56 2.6.3 Linux on IBM Z . 56 2.7 Special considerations for a single server CTN . 57 © Copyright IBM Corp. 2020. All rights reserved. iii 8480TOC.fm Draft Document for Review August 3, 2020 8:32 pm 2.7.1 Hardware and ETS planning for single server configuration. 57 2.7.2 Software planning: z/OS currently running in a sysplex . 58 2.7.3 Software planning: z/OS systems currently not in a sysplex. 59 2.8 Migration planning. 60 2.8.1 CTN types and recovery voting. 60 2.8.2 Server maintenance and replacement . 61 2.8.3 N-2 Rule and Coupling Link migration considerations . 61 2.8.4 Power options (PDU/BPA/IBF) considerations . 62 Chapter 3. Configuration and operations . 63 3.1 Displaying and monitoring the environment . 64 3.1.1 CPC Detail panel . 64 3.1.2 The Manage System Time panel . 64 3.1.3 z/OS display commands . 67 3.1.4 z/OS messages. 69 3.2 Configuring the Coordinated Timing Network . 71 3.2.1 Single Server CTN . 71 3.2.2 Dual Server CTN. 78 3.2.3 CTN with three servers - PTS, BTS, and Arbiter. 80 3.3 Configuring Precision Time Protocol as ETS . 81 3.3.1 Configuring ETS (PTP w/ PPS). 83 3.4 Managing the time. 88 3.4.1 STP time adjustment. 88 3.4.2 STP offset adjustments. 91 3.4.3 Changes in local time . 96 3.4.4 Logical partition time offset ..
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