Positioning Paper November, 2019 Coupling Facility Configuration Options David Raften [email protected] Coupling Facility Configuration Options Table of Contents Coupling Facility Options .............................................................................................................................................. 4 The Coupling Facility ................................................................................................................................................ 5 Stand-alone Coupling Facilities ................................................................................................................................ 8 Logical Stand-alone Coupling Facilities .................................................................................................................... 9 Message Time Ordering and STP ........................................................................................................................ 10 Coupling Facility LPAR on a Server ..................................................................................................................... 12 Dynamic Coupling Facility Dispatch ................................................................................................................... 13 Dynamic CF Dispatch Performance .................................................................................................................... 14 Coupling Thin Interrupts .................................................................................................................................... 17 Internal Coupling Facility ....................................................................................................................................... 18 Link Technologies ....................................................................................................................................................... 21 When would I configure 12x DDR and SDR Parallel Sysplex InfiniBand? .......................................................... 24 When would I configure 1x Parallel Sysplex InfiniBand? ................................................................................... 24 Prerequisites ...................................................................................................................................................... 25 Migrating to ICA (CS5) from HCA3-O (IFB3 12x) links ....................................................................................... 25 Coupling Link Roadmap ...................................................................................................................................... 26 Performance of links ........................................................................................................................................... 29 Dense Wavelength Division Multiplexer ................................................................................................................. 29 Performance Implications of Each CF Option ........................................................................................................ 30 Standalone CF and General Purpose Server ...................................................................................................... 32 Performance of Internal Coupling Facility (ICF) ................................................................................................. 32 Dedicated and Shared CPs ................................................................................................................................. 33 Performance of the Coupling Facilities ...................................................................................................................... 35 Number of CF Engines ........................................................................................................................................ 35 Comparison of Coupling Efficiencies Across Coupling Technologies ................................................................. 36 Cost/Value Implications of Each CF Option ........................................................................................................... 39 Standalone Coupling Facilities ........................................................................................................................... 39 System-managed CF Structure Duplexing ......................................................................................................... 42 Asynchronous CF Structure Duplexing for Lock Structures ............................................................................... 42 Structure Placement ................................................................................................................................................... 46 Resource Sharing Environment .............................................................................................................................. 46 Resource Sharing: CF Structure Placement ....................................................................................................... 49 Data Sharing Environments .................................................................................................................................... 50 Data Sharing: CF Structure Placement ............................................................................................................... 51 Lock Structures ................................................................................................................................................... 51 Cache Structures ................................................................................................................................................ 52 Transaction Log Structures................................................................................................................................. 52 Other CF Structures Requiring Failure Independence ....................................................................................... 53 Other CF Structures NOT Requiring Failure Independence ............................................................................... 53 Failure Independence with System-managed CF Structure Duplexing ............................................................. 55 Combining an ICF with Standalone CF ................................................................................................................... 55 Other Configuration Considerations ........................................................................................................................... 57 CFCC concurrent patch apply: ................................................................................................................................ 57 Coupling Facility Flash Express Exploitation .......................................................................................................... 58 2 Coupling Facility Configuration Options Single Server Parallel Sysplex: ............................................................................................................................... 58 Single ICF or Two ICFs: .......................................................................................................................................... 59 Single z/OS Parallel Sysplex: .................................................................................................................................. 60 Other Considerations and Upgrade Paths .............................................................................................................. 60 Pervasive Encryption Support .................................................................................................................................... 61 Summary .................................................................................................................................................................... 61 Appendix A. Parallel Sysplex Exploiters - Recovery Matrix........................................................................................ 64 Appendix B. Resource Sharing Exploiters - Function and Value ................................................................................ 66 Resource Sharing Exploiters ...................................................................................................................................... 66 XCF, High Speed Signaling .................................................................................................................................. 67 System Logger, OPERLOG and LOGREC ............................................................................................................. 67 z/OS GRS Star ..................................................................................................................................................... 68 z/OS Security Server (RACF), High-speed Access to Security Profiles .............................................................. 68 JES2, Checkpoint ................................................................................................................................................ 68 SmartBatch, Cross System BatchPipes .............................................................................................................. 68 VTAM GR (non LU6.2) for TSO ............................................................................................................................ 69 DFSMShsm Common Recall Queue ...................................................................................................................