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Note: z/OS.e is exclusive to z9 BC, z890, and z800.
STP is available as a feature on z9 EC, z9 BC, z990, and z890 servers, and is supported by z/OS and z/OS.e V1.7 and above.
Even though the planned availability version of z/OS and z/OS.e V1.7 and V1.8 have function to support STP, additional software maintenance is required. Maintenance being installed on the z/OS and z/OS.e system image can be done using the "rolling IPL" process, which allows you to avoid a sysplex-wide outage. The "rolling IPL" process allows coexistence of the following system images:
- z/OS and z/OS.e V1.7 or above with the maintenance
- z/OS and z/OS.e V1.7 or above without the maintenance
- z/OS and z/OS.e V1.4 through z/OS and z/OS.e V1.6
Software support for Timing-only links
Timing-only links are Coupling links that allow two servers to be synchronized using STP messages, when a CF does not exist at either end of the Coupling link. If Timing-only links are required for the configuration, then PTFs are also needed.
z/OS and z/OS.e V1.4 through z/OS and z/OS.e V1.6 considerations
z/OS provides compatibility and flexibility as images migrate by allowing several releases of z/OS and z/OS.e to coexist in a Sysplex or a Parallel Sysplex® multisystem configuration. z/OS and z/OS.e V1.7 are compatibility supported with releases back to z/OS and z/OS.e V1.4. This means that z/OS and z/OS.e V1.4 can coexist in the same sysplex as z/OS and z/OS.e V1.7. Although an STP-only CTN must consist of only z/OS and z/OS.e V1.7 or later systems, a mixed-CTN can include any coexistence-supported releases, as long as the toleration PTFs are installed. For example, z/OS and z/OS.e V1.7 can coexist with z/OS V1.4 and z/OS.e in the same timing network in the same sysplex.
You should consult the Preventive Service Planning (PSP) buckets for STP related maintenance. They are listed in the 2084DEVICE, 2086DEVICE, 2094DEVICE and 2096DEVICE PSP buckets for the z990, z890, z9 EC and z9 BC respectively.
To simplify the identification of PTFs needed to support Server Timer Protocol, a functional PSP bucket has been created. You can use the Enhanced Preventive Service Planning Tool (EPSPT), which is available on the " Technical Help Database for Mainframe Preventive Service Planning Buckets" website and the Enhanced PSP Tool to reconcile the recommended service for the STP function and the hardware device against your systems target zones. Detailed information on the EPSPT is available on the IBM Education Assistant website in the "General Topic View" under "z/OS Operating System".
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