IBM Z10 BC Coupling Facility Configuration Alternatives, System-Managed CF Structure Duplexing

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16 allows one of these protocol exchanges to complete asynchronously. This allows faster duplexed request ser- vice time, with more benefi ts when the Coupling Facilities are further apart, such as in a multi-site Parallel Sysplex environment.

List notification improvements: Prior to CFCC Level 16, when a shared queue (subsidiary list) changed state from empty to non-empty, the CF would notify ALL active con- nectors. The fi rst one to respond would process the new message, but when the others tried to do the same, they would fi nd nothing, incurring additional overhead.

CFCC Level 16 can help improve the effi ciency of coupling communications for IMS Shared Queue and WebSphere MQ Shared Queue environments. The Coupling Facility notifi es only one connector in a sequential fashion. If the shared queue is processed within a fi xed period of time, the other connectors do not need to be notifi ed, saving the cost of the false scheduling. If a shared queue is not read within the time limit, then the other connectors are notifi ed as they were prior to CFCC Level 16.

When migrating CF levels, lock, list and cache structure sizes might need to be increased to support new function. For example, when you upgrade from CFCC Level 15 to Level 16 the required size of the structure might increase. This adjustment can have an impact when the system allocates structures or copies structures from one coupling facility to another at different CF levels.

The coupling facility structure sizer tool can size struc- tures for you and takes into account the amount of space needed for the current CFCC levels.

Access the tool at:

http://www.ibm.com/servers/eserver/zseries/cfsizer/.

CFCC Level 16 is exclusive to System z10 and is sup- ported by z/OS and z/VM for guest exploitation.

Coupling Facility Configuration Alternatives

IBM offers multiple options for confi guring a functioning Coupling Facility:

•Standalone Coupling Facility: The standalone CF provides the most “robust” CF capability, as the CPC is wholly dedicated to running the CFCC microcode — all of the processors, links and memory are for CF use only. A natural benefi t of this characteristic is that the standalone CF is always failure-isolated from exploiting z/OS software and the server that z/OS is running on for environments without System-Managed CF Structure Duplexing. The z10 BC with capacity indicator A00 is used for systems with ICF(s) only. There are no software charges associated with such a confi guration.

•Internal Coupling Facility (ICF): Customers consider- ing clustering technology can get started with Parallel Sysplex technology at a lower cost by using an ICF instead of purchasing a standalone Coupling Facility. An ICF feature is a processor that can only run Coupling Facility Control Code (CFCC) in a partition. Since CF LPARs on ICFs are restricted to running only CFCC, there are no IBM software charges associated with ICFs. ICFs are ideal for Intelligent Resource Director and resource sharing environments as well as for data shar- ing environments where System-Managed CF Structure Duplexing is exploited.

System-Managed CF Structure Duplexing

System-Managed Coupling Facility (CF) Structure Duplex- ing provides a general purpose, hardware-assisted, easy- to-exploit mechanism for duplexing CF structure data. This provides a robust recovery mechanism for failures such as loss of a single structure or CF or loss of connectivity to a single CF, through rapid failover to the backup instance of the duplexed structure pair. CFCC Level 16 provides CF Duplexing enhancements described previously in the sec- tion titled “Coupling Facility Control Code (CFCC) Level 16”.

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Contents IBM System z10 Business Class z10 BC Reference Guide Table of Contents IBM System z10 Business Class z10 BC Overview Think Big, Virtually LimitlessMore Solutions, More Affordable Special workloads, Specialty engines, affordable technologyNew Face Of System z Architecture operating system support ArchitectureZ10 BC Architecture Page Commitment to system integrity VSE TPFLinux on System z Operating System ESA/390Z10 BC Page Page Z10 BC Design and Technology Memory Dimm sizes 2 GB and 4 GB Z10 BC ModelZ10 BC capacity identifiers Z10 BC model upgrades Z10 BC Model Capacity IDsCPU Measurement Facility Z10 BC PerformanceLarge System Performance Reference Z10 BC I/O Subsystem System I/O Configuration AnalyzerZ10 BC Channels and I/O Connectivity Modes of Operation Concurrent UpdateSupport of Spanned Channels and Logical Partitions Ficon Support for Cascaded Directors FCP ChannelsFCP Full fabric connectivity FCP increased performance for small block sizesScsi IPL now a base function High Performance Ficon improvement in performancePreplanning and setup of SAN for a System z10 environment Platform and name server registration in Ficon channelNPort ID Virtualization DistanceFicon Express enhancements for Storage Area Networks Program Directed re-IPLFicon Link Incident Reporting Serviceability EnhancementsFeature Infrastructure Ports per OSA-Express3 the newest family of LAN adaptersOSA-Express3 Ethernet features Summary of benefits OSA-Express2 availabilityType FeaturesPurpose/Traffic OSA-Express3 10 Gigabit Ethernet LROSA-Express3 1000BASE-T Ethernet OSA-Express3-2P Gigabit Ethernet SXFour-port exploitation on OSA-Express3 GbE SX and LX OSA-Express3-2P 1000BASE-T EthernetNetwork Traffic Analyzer Link aggregation for z/VM in Layer 2 mode Dynamic LAN idle for z/OSLayer 2 transport mode When would it be used? OSA Layer 3 Virtual MAC for z/OSIBM Communication Controller for Linux CCL Direct Memory Access DMAHardware data router OSA-Express3 and OSA-Express2 OSN OSA for NCPOSA/SF Virtual MAC and Vlan id Display Capability OSA Integrated Console ControllerRemove L2/L3 LPAR-to-LPAR Restriction HiperSockets HiperSockets Enhancement for zIIP Exploitation CP Assist for Cryptographic Function Cpacf Security CryptographyCan Do IT securely Crypto Express2-1P Enhancements to CP Assist for Cryptographic Func Tion CpacfConfigurable Crypto Express2 Dynamically add crypto to a logical partition Support for ISOSupport for RSA keys up to 4096 bits Secure Key AESEnhancement with TKE 5.3 LIC Support for 13- thru 19-digit Personal Account NumbersTKE 5.3 workstation Smart Card ReaderRemote Loading of Initial ATM Keys TKE additional smart cards new featureSystem z10 BC cryptographic migration Remote Key Loading BenefitsOn Demand Capabilities Capacity on Demand Temporary CapacityAmendment for CBU Tests Capacity Provisioning OS Capacity provisioning allows you to set up rules System z9 System z10Reliability, Availability, and Serviceability RAS RAS Design FocusHardware System Area HSA Enhanced Driver MaintenanceAvailability Functions Redundant I/O InterconnectService Enhancements Dynamic Oscillator SwitchoverConcurrent Memory Upgrade Transparent SparingEnvironmental Enhancements Power MonitoringPower Estimation Tool IBM Systems Director Active Energy ManagerCoupling Facility Control Code Cfcc Level Improved service time with Coupling Facility DuplexParallel Sysplex Cluster Technology Coupling Facility Configuration Alternatives System-Managed CF Structure DuplexingParallel Sysplex Coupling Connectivity Introducing long reach InfiniBand coupling linksCoupling Connectivity for Parallel Sysplex Server Time Protocol STP Z10 Coupling Link OptionsTime synchronization and time accuracy on z10 BC Server Time Protocol enhancementsPreview Improved STP System Management with Enhanced STP recovery when Internal Battery Feature Continuous Availability of NTP servers used as ExterInternal Battery Feature Recommendation Application Programming Interface API to automateInternet Protocol, Version 6 IPv6 HMC System SupportFamily Machine Type HMC/SE Console MessengerEnhanced installation support for z/VM using the HMC HMC z/VM Tower System Management EnhancementsImplementation Services for Parallel Sysplex Fiber Quick Connect for Ficon LX Environments GdpsZ10 BC Highlights and Physical Dimensions Z9 BC Z10 BC Physical CharacteristicsZ10 BC System Power Physical PlanningZ10 BC Configuration Detail Z10 BC Concurrent PU ConversionsIBF Z10 BC Model StructureZ10 BC Minimum Maximum Z10 BC IBF hold uptime Drawer DrawersCoupling Facility CF Level of Support Z890Statement of Direction Available in the Library section of Resource Link PublicationsFollowing Redbook publications are available now Resource LinkZSO03021-USEN-02
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