Draft Document for Review September 23, 2019 1:27 am 8860ch08.fm 8.1 Preparing for Parallel Sysplex 8.2 Preparing for non-sysplex system time synchronization 8.3 Server Time Protocol overview If your z15 is a member of a Parallel Sysplex or if you create a new Parallel Sysplex involving  the IBM z15, time synchronization among CPCs is required. For time synchronization, you  must use the Server Time Protocol feature (FC #1021). In addition to the time  synchronization, the following tasks are required in preparation for Sysplex: Defining CF (coupling) links is described in Chapter 9, “Defining Coup ling Facility links” on  page 193. Defining the image profile is described in 5.4, “Creating an Image Profile on the  8561 Support Element” on page 102. If your z15 is not part of a Parallel Sysplex but you want to synchronize the time among  multiple CPCs, you need the STP function and STP-only (timing) links. These configuration  steps are required: Defining STP-only (timing) links is described in 9.5, “Defining an STP timing-only link by using  ICA SR” on page 207.  This chapter describes how to set up STP on a z15 server. STP provides time synchronization among multiple CPCs in a Coordinated Timing Network  (CTN). CTN is a collection of servers that are synchronized to a time value called Coordinated  Server Time (CST). STP function (feature) is implemented in the Licensed Internal Code  (LIC) as a chargeable feature. You must order STP enablement feature code #1021 to use  STP.  For more information about STP concepts and planning information, see the  Server Time  Protocol Planning Guide , SG24-7280.  1. Defining STP-only (timing) links. 2. Configuring STP. 1. Defining CF (coupling) links. 2. Defining FICON CTC connections (optional). 3. Defining the CF LPAR. 4. Defining the CF LPAR image profile in HMC. 5. Configuring STP. 164  IBM z15 (8561) Configuration Setup