IBM Z10 EC manual Enhanced Network Time Protocol NTP client support

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The following STP enhancements are available on System z10 and System z9 servers.

The STP feature and the latest Machine Change Levels are required.

Enhanced Network Time Protocol (NTP) client support:

This enhancement addresses the requirements for those who need to provide the same accurate time across het- erogeneous platforms in an enterprise.

The STP design has been enhanced to include support for a Simple Network Time Protocol (SNTP) client on the Support Element. By confi guring an NTP server as the STP External Time Source (ETS), the time of an STP-only Coordinated Timing Network (CTN) can track to the time provided by the NTP server, and maintain a time accuracy of 100 milliseconds.

Note: NTP client support has been available since October 2007.

Enhanced accuracy to an External Time Source: The time accuracy of an STP-only CTN has been improved by adding the capability to confi gure an NTP server that has a pulse per second (PPS) output signal as the ETS device. This type of ETS device is available worldwide from sev- eral vendors that provide network timing solutions.

STP has been designed to track to the highly stable, accurate PPS signal from the NTP server, and maintain an accuracy of 10 microseconds as measured at the PPS input of the System z server. A number of variables such as accuracy of the NTP server to its time source (GPS, radio signals for example), and cable used to connect the PPS signal will determine the ultimate accuracy of STP to Coordinated Universal Time (UTC).

In comparison, the IBM Sysplex Timer is designed to maintain an accuracy of 100 microseconds when attached to an ETS with a PPS output. If STP is confi gured to use

a dial-out time service or an NTP server without PPS, it is designed to provide a time accuracy of 100 milliseconds to the ETS device.

For this enhancement, the NTP output of the NTP server has to be connected to the Support Element (SE) LAN, and the PPS output of the same NTP server has to be con- nected to the PPS input provided on the External Time Reference (ETR) feature of the System z10 or System z9 server.

Continuous availability of NTP servers used as Exter-

nal Time Source: Improved External Time Source (ETS) availability can now be provided if you confi gure different NTP servers for the Preferred Time Server (PTS) and the Backup Time Server (BTS). Only the PTS or the BTS can be the Current Time Server (CTS) in an STP-only CTN. Prior to this enhancement, only the CTS calculated the time adjustments necessary to maintain time accuracy. With this enhancement, if the PTS/CTS cannot access the NTP server or the pulse per second (PPS) signal from the NTP server, the BTS, if confi gured to a different NTP server, may be able to calculate the adjustment required and propagate it to the PTS/CTS. The PTS/CTS in turn will per- form the necessary time adjustment steering.

This avoids a manual reconfi guration of the BTS to be the CTS, if the PTS/CTS is not able to access its ETS. In an ETR network when the primary Sysplex Timer is not able to access the ETS device, the secondary Sysplex Timer takes over the role of the primary - a recovery action not

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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 Just-in-time deployment of IT resources Specialty engines offer an attractive alternativeOrder of introduction Numerical computing on the chipEvolving for your business ArchitectureLiberating your assets with System z Z10 EC ArchitecturePage Commitment to system integrity Page VSE TPFLinux on System z Z10 EC Operating System ESA/390Page Page Z10 EC Design and Technology Z10 EC Model Z10 EC model upgrades Z10 EC Base and Sub-capacity OfferingsZ10 EC Performance Large System Performance ReferenceCPU Measurement Facility Z10 EC I/O Subsystem System I/O Configuration AnalyzerZ10 EC Channels and I/O Connectivity Support of Spanned Channels and Logical Partitions Concurrent UpdateFicon Express4 and Ficon Express2 Performance Modes of OperationFicon Support for Cascaded Directors FCP ChannelsFCP increased performance for small block sizes Ficon and FCP for connectivity to disk, tape, and printers Scsi IPL now a base functionFCP Full fabric connectivity Platform and name server registration in Ficon channelIt will register NPort ID Virtualization Program Directed re-IPLFeature Infrastructure Ports per OSA-Express3 Ethernet features Summary of benefitsPort density or granularity Purpose/Traffic FeaturesOSA-Express2 availability TypeOSA-Express3 Gigabit Ethernet SX OSA-Express3 10 Gigabit Ethernet SROSA-Express3 Gigabit Ethernet LX Four-port exploitation on OSA-Express3 GbE SX and LXNetwork Traffic Analyzer Dynamic LAN idle for z/OSLink aggregation for z/VM in Layer 2 mode Layer 2 transport mode When would it be used?Hardware data router Direct Memory Access DMAOSA Layer 3 Virtual MAC for z/OS IBM Communication Controller for Linux CCLOSA Integrated Console Controller Remove L2/L3 LPAR-to-LPAR RestrictionOSA/SF Virtual MAC and Vlan id Display Capability HiperSockets HiperSockets Enhancement for zIIP Exploitation Security Cryptography Can Do IT securelyCP Assist for Cryptographic Function Cpacf Configurable Crypto Express2 Dynamically add crypto to a logical partition Secure Key AESTKE additional smart cards TKE 5.3 workstation and support for Smart Card ReaderEnhancement with TKE 5.3 LIC System z10 EC cryptographic migrationRemote Loading of Initial ATM Keys Remote Key Loading BenefitsImproved Key Exchange With Non-CCA Cryptographic Systems On 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 FocusAvailability Functions Hardware System Area HSAEnhanced Book Availability Concurrent Defective Book Replacement Concurrent Physical Memory UpgradeConcurrent Physical Memory Replacement Enhanced Driver MaintenanceTransparent Sparing Plan Ahead MemoryPower Estimation Tool Service EnhancementsPower Monitoring Environmental EnhancementsParallel Sysplex Cluster Technology IBM Systems Director Active Energy ManagerImproved service time with Coupling Facility Duplex Coupling Facility Control Code Cfcc LevelCoupling Facility Configuration Alternatives System-Managed CF Structure DuplexingParallel Sysplex Coupling Connectivity Introducing long reach InfiniBand coupling links Coupling Connectivity for Parallel SysplexZ10 Coupling Link Options Z10 EC MaxTime synchronization and time accuracy on z10 EC Server Time Protocol STPPreview Improved STP System Management with Enhanced Network Time Protocol NTP client support Continuous availability of NTP servers used as ExterEnhanced STP recovery when Internal Battery Feature NTP server on Hardware Management Console HMCApplication Programming Interface API to automate Internal Battery Feature Recommendation Internet Protocol, Version 6 IPv6 HMC System SupportFamily Machine Type HMC/SE Console MessengerHMC z/VM Tower systems management enhancements Implementation Services for Parallel Sysplex GdpsFiber Quick Connect for Ficon LX Environments Z10 EC Environmentals Model O Cage Z10 EC Physical Characteristics Z10 EC Configuration DetailZ10 EC Dimensions Z9 EC Number of Frames 2 Frame Model O CageCPs IFLs Processor Unit Features ModelOSA-Express3 and OSA-Express2 Features Min Max ICFsGeneral Information Coupling Facility CF Level of Support Z9 BCStatement of Direction Publications Following Redbook publications are available nowResource Link ZSO03018-USEN-02
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