IBM Z10 EC manual Time synchronization and time accuracy on z10 EC, Server Time Protocol STP

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Time synchronization and time accuracy on z10 EC

If you require time synchronization across multiple servers (for example you have a Parallel Sysplex environment) or you require time accuracy either for one or more System z servers or you require the same time across heteroge- neous platforms (System z, UNIX, AIX®, etc.) you can meet these requirements by either installing a Sysplex Timer Model 2 (9037-002) or by implementing Server Time Proto- col (STP).

The Sysplex Timer Model 2 is the centralized time source that sets the Time-Of-Day (TOD) clocks in all attached servers to maintain synchronization. The Sysplex Timer Model 2 provides the stepping signal that helps ensure that all TOD clocks in a multi-server environment incre- ment in unison to permit full read or write data sharing with integrity. The Sysplex Timer Model 2 is a key component of an IBM Parallel Sysplex environment and a GDPS® avail- ability solution for On Demand Business.

The z10 EC server requires the External Time Reference (ETR) feature to attach to a Sysplex Timer. The ETR fea- ture is standard on the z10 EC and supports attachment at an unrepeated distance of up to three kilometers (1.86 miles) and a link data rate of 8 Megabits per second.

The distance from the Sysplex Timer to the server can be extended to 100 km using qualifi ed Dense Wavelength Division Multiplexers (DWDMs). However, the maximum repeated distance between Sysplex Timers is limited to 40 km.

Server Time Protocol (STP)

STP is a message-based protocol in which timekeeping information is transmitted between servers over externally defi ned coupling links. ICB-4, ISC-3, and Infi niBand cou- pling links can be used to transport STP messages.

Server Time Protocol (STP) Enhancements

STP configuration and time information restoration after Power on Resets (POR) or power outage: This

enhancement delivers system management improvements by restoring the STP confi guration and time information after Power on Resets (PORs) or power failure that affects both servers of a two server STP-only Coordinated Timing Network (CTN). To enable this function the customer has to select an option that will assure than no other servers can join the two server CTN. Previously, if both the Preferred Time Server (PTS) and the Backup Time Server (BTS) experienced a simultaneous power outage (site failure), or both experienced a POR, reinitialization of time, and special roles (PTS, BTS, and CTS) was required. With this enhancement, you will no longer need to reinitialize the time or reassign the roles for these events.

Preview - Improved STP System Management with

new z/OS Messaging: This is a new function planned to generate z/OS messages when various hardware events that affect the External Time Sources (ETS) confi gured for an STP-only CTN occur. This may improve problem deter- mination and correction times. Previously, the messages were generated only on the Hardware Management Con- sole (HMC).

The ability to generate z/OS messages will be supported on IBM System z10 and System z9 servers with z/OS 1.11 (with enabling support rolled back to z/OS 1.9) in the second half of 2009.

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Contents IBM System z10 Enterprise Class z10 EC Reference Guide Table of Contents IBM System z10 Enterprise Class z10 EC Overview Specialty engines offer an attractive alternative Just-in-time deployment of IT resourcesNumerical computing on the chip Order of introductionLiberating your assets with System z ArchitectureEvolving for your business Z10 EC ArchitecturePage Commitment to system integrity Page Linux on System z VSETPF Operating System ESA/390 Z10 ECPage Page Z10 EC Design and Technology Z10 EC Model Z10 EC Base and Sub-capacity Offerings Z10 EC model upgradesCPU Measurement Facility Z10 EC PerformanceLarge System Performance Reference System I/O Configuration Analyzer Z10 EC I/O SubsystemZ10 EC Channels and I/O Connectivity Ficon Express4 and Ficon Express2 Performance Concurrent UpdateSupport of Spanned Channels and Logical Partitions Modes of OperationFCP increased performance for small block sizes Ficon Support for Cascaded DirectorsFCP Channels FCP Full fabric connectivity Scsi IPL now a base functionFicon and FCP for connectivity to disk, tape, and printers Platform and name server registration in Ficon channelIt will register Program Directed re-IPL NPort ID VirtualizationPort density or granularity Feature Infrastructure Ports perOSA-Express3 Ethernet features Summary of benefits OSA-Express2 availability FeaturesPurpose/Traffic TypeOSA-Express3 Gigabit Ethernet LX OSA-Express3 10 Gigabit Ethernet SROSA-Express3 Gigabit Ethernet SX Four-port exploitation on OSA-Express3 GbE SX and LXDynamic LAN idle for z/OS Network Traffic AnalyzerLayer 2 transport mode When would it be used? Link aggregation for z/VM in Layer 2 modeOSA Layer 3 Virtual MAC for z/OS Direct Memory Access DMAHardware data router IBM Communication Controller for Linux CCLOSA/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 Configurable Crypto Express2 Secure Key AES Dynamically add crypto to a logical partitionEnhancement with TKE 5.3 LIC TKE 5.3 workstation and support for Smart Card ReaderTKE additional smart cards System z10 EC cryptographic migrationImproved Key Exchange With Non-CCA Cryptographic Systems Remote Loading of Initial ATM KeysRemote Key Loading Benefits Capacity on Demand Temporary Capacity On Demand CapabilitiesAmendment for CBU Tests Capacity Provisioning System z9 System z10 OS Capacity provisioning allows you to set up rulesRAS Design Focus Reliability, Availability, and Serviceability RASEnhanced Book Availability Availability FunctionsHardware System Area HSA Concurrent Physical Memory Replacement Concurrent Physical Memory UpgradeConcurrent Defective Book Replacement Enhanced Driver MaintenancePlan Ahead Memory Transparent SparingPower Monitoring Service EnhancementsPower Estimation Tool Environmental EnhancementsIBM Systems Director Active Energy Manager Parallel Sysplex Cluster TechnologyCoupling Facility Control Code Cfcc Level Improved service time with Coupling Facility Duplex Parallel Sysplex Coupling Connectivity Coupling Facility Configuration Alternatives System-Managed CF Structure Duplexing Coupling Connectivity for Parallel Sysplex Introducing long reach InfiniBand coupling linksZ10 EC Max Z10 Coupling Link OptionsPreview Improved STP System Management with Time synchronization and time accuracy on z10 ECServer Time Protocol STP Continuous availability of NTP servers used as Exter Enhanced Network Time Protocol NTP client supportApplication Programming Interface API to automate Enhanced STP recovery when Internal Battery FeatureNTP server on Hardware Management Console HMC Internal Battery Feature Recommendation Family Machine Type HMC System SupportInternet Protocol, Version 6 IPv6 HMC/SE Console MessengerHMC z/VM Tower systems management enhancements Gdps Implementation Services for Parallel SysplexFiber Quick Connect for Ficon LX Environments Z10 EC Dimensions Z9 EC Number of Frames 2 Frame Z10 EC Physical Characteristics Z10 EC Configuration DetailZ10 EC Environmentals Model O Cage Model O CageOSA-Express3 and OSA-Express2 Features Min Max Processor Unit Features ModelCPs IFLs ICFsGeneral Information Z9 BC Coupling Facility CF Level of SupportStatement of Direction Resource Link PublicationsFollowing Redbook publications are available now ZSO03018-USEN-02
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