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by Paulo Vitor Pereira, George Kozakos, Hans-Peter Eckam, Octavian Lascu
Server Time Protocol Planning Guide
Front cover
Notices
Trademarks
Preface
Authors
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Summary of changes
June 2013, Fourth Edition
Chapter 1. Introduction to Server Time Protocol
1.1 Introduction to time synchronization
1.1.1 Time-of-Day clock
1.1.2 Time synchronization in a Parallel Sysplex
1.1.3 Overview of External Time Reference
1.2 Overview of Server Time Protocol
1.3 STP concepts and terminology
1.3.1 STP facility
1.3.2 TOD clock synchronization
1.3.3 STP servers
1.3.4 Coordinated Timing Network
1.3.5 STP stratum
1.3.6 Server roles in an STP-only CTN
1.4 Timing network types
1.4.1 Mixed CTN
1.4.2 STP-only CTN
1.5 Coupling links
1.5.1 Link redundancy
1.5.2 Coupling link requirements in a non-sysplex configuration
1.6 External time source
1.7 Summary of STP terminology
Chapter 2. Planning hardware and software
2.1 Planning hardware
2.1.1 Servers
2.1.2 Hardware Management Console
2.1.3 Support Elements
2.1.4 EC levels and MCLs
2.1.5 Installing the STP feature
2.1.6 z/BX considerations
2.2 Planning connectivity
2.2.1 Planning for coupling links for STP
2.2.2 Planning for timing-only links
2.2.3 Considerations for multi-site sysplex
2.3 External time source
2.3.1 Dial-out on the Hardware Management Console
2.3.2 NTP server
2.3.3 NTP server with pulse per second
2.4 Internal Battery Feature (IBF)
2.5 Planning z/OS software
2.5.1 z/OS requirements for STP
2.5.2 CLOCKxx
2.6 Planning for z/VM
2.6.1 STP state flow in z/VM
2.6.2 Updated CP commands
2.6.3 z/VM IOCP
2.6.4 VM guests
2.6.5 z/TPF
2.7 Special considerations for a single server STP-only CTN
2.7.1 Software planning: z/OS currently running in a sysplex
2.7.2 Software planning: z/OS systems currently not in a sysplex
2.7.3 Software planning: z/OS systems currently in a sysplex using ETR
2.8 Planning for zBX
2.9 Operating systems with no STP support
2.9.1 Linux for System z
2.9.2 z/VSE
Chapter 3. Operations
3.1 Displaying and monitoring the environment
3.1.1 CPC Detail panel
3.1.2 System (Sysplex) Time panel
3.1.3 z/OS display commands
3.1.4 z/OS messages
3.2 Configuring the Coordinated Timing Network
3.2.1 Configuring a Mixed CTN
3.2.2 Configuring an STP-only CTN
3.3 Managing the time
3.3.1 STP time adjustment
3.3.2 STP offset adjustments
3.3.3 Changes in local time
3.3.4 Logical partition time offset
3.3.5 Parallel Sysplex and multiple time zones
3.4 Managing the CTN configuration
3.4.1 Changing the CTN ID
3.4.2 Single-server or dual-server auto resume after power-on reset
3.4.3 Changing the Current Time Server
3.4.4 Changing the server roles
3.4.5 Deconfiguring a CTN
3.5 Operational considerations
3.5.1 Migrating timing-only links to coupling links
3.5.2 Coupling link path validation
3.5.3 Last timing link validation and operational safeguards
3.5.4 Last timing link condition examples
3.5.5 Disruptive actions on the Current Time Server
3.5.6 Disruptive actions on the BTS or Arbiter
3.5.7 Restarting a CTN power outage or power-on reset (unplanned)
3.5.8 Planned single-site maintenance
3.6 MES upgrade considerations
3.6.1 Mixed CTN
3.6.2 STP-only CTN
Chapter 4. Recovery concepts
4.1 Terminology overview
4.2 Freewheel interval
4.3 Server offline signal
4.4 Going Away Signal
4.5 Arbiter-assisted recovery
4.6 Console-assisted recovery
4.6.1 Console-assisted recovery in a CTN with BTS
4.6.2 Console-assisted recovery in a CTN with BTS and Arbiter
4.7 Island condition
4.8 Switch to local timing mode
4.9 External Time Source (ETS)
Appendix A. Migration planning
Preparation and installation
Migration between an ETR network and a Mixed CTN
Migration between a Mixed CTN and an STP-only CTN
Migration from an ETR network to an STP-only CTN
Installation of a new STP-only CTN
Installation of a single-server STP-only CTN
Enhancing a single-site ETR network to a Mixed CTN across two sites
Appendix B. Server Time Protocol (STP) messages in z/OS
Supervisor messages
XCF messages
XES messages
Automating-related messages
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Note: Before using this information and the product it supports, read the information in “Notices” on page vii.
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