IBM Z10 BC manual Continuous Availability of NTP servers used as Exter

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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 always accepted by some customers. The STP design provides continuous availability of ETS while maintaining the special roles of PTS and BTS as – signed by the cus- tomer.

The availability improvement is available when the ETS is confi gured as an NTP server or an NTP server using PPS.

NTP Server on Hardware Management Console: Improved security can be obtained by providing NTP server support on the HMC. If an NTP server (with or with- out PPS) is confi gured as the ETS device for STP, it needs to be attached directly to the Support Element (SE) LAN. The SE LAN is considered by many users to be a private dedicated LAN to be kept as isolated as possible from the intranet or Internet.

Since the HMC is normally attached to the SE LAN, pro- viding an NTP server capability on the HMC addresses the potential security concerns most users may have for

attaching NTP servers to the SE LAN. The HMC, via a separate LAN connection, can access an NTP server avail- able either on the intranet or Internet for its time source. Note that when using the HMC as the NTP server, there is no pulse per second capability available. Therefore, you should not confi gure the ETS to be an NTP server using PPS.

Enhanced STP recovery when Internal Battery Feature

is in use: Improved availability can be obtained when power has failed for a single server (PTS/CTS), or when there is a site power outage in a multi site confi guration where the PTS/CTS is installed (the site with the BTS is a different site not affected by the power outage).

If an Internal Battery Feature (IBF) is installed on your System z server, STP now has the capability of receiving notifi cation that customer power has failed and that the IBF is engaged. When STP receives this notifi cation from a server that has the role of the PTS/CTS, STP can automati- cally reassign the role of the CTS to the BTS, thus automat- ing the recovery action and improving availability.

STP configuration and time information saved across

Power on Resets (POR) or power outages: This enhancement delivers system management improvements by saving the STP confi guration across PORs and power failures for a single server STP-only CTN. Previously, if the server was PORed or experienced a power outage, the time, and assignment of the PTS and CTS roles would have to be reinitialized. You will no longer need to reinitial- ize the time or reassign the role of PTS/CTS across POR or power outage events.

Note that this enhancement is also available on the z990 and z890 servers.

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Contents IBM System z10 Business Class z10 BC Reference Guide Table of Contents Think Big, Virtually Limitless IBM System z10 Business Class z10 BC OverviewSpecial workloads, Specialty engines, affordable technology More Solutions, More AffordableNew Face Of System z Z10 BC Architecture ArchitectureArchitecture operating system support Page Commitment to system integrity TPF VSEOperating System ESA/390 Linux on System zZ10 BC Page Page Z10 BC Design and Technology Z10 BC capacity identifiers Z10 BC ModelMemory Dimm sizes 2 GB and 4 GB Z10 BC Model Capacity IDs Z10 BC model upgradesLarge System Performance Reference Z10 BC PerformanceCPU Measurement Facility System I/O Configuration Analyzer Z10 BC I/O SubsystemZ10 BC Channels and I/O Connectivity Support of Spanned Channels and Logical Partitions Concurrent UpdateModes of Operation FCP Channels Ficon Support for Cascaded DirectorsHigh Performance Ficon improvement in performance FCP increased performance for small block sizesScsi IPL now a base function FCP Full fabric connectivityPlatform and name server registration in Ficon channel Preplanning and setup of SAN for a System z10 environmentProgram Directed re-IPL DistanceFicon Express enhancements for Storage Area Networks NPort ID VirtualizationOSA-Express3 the newest family of LAN adapters Serviceability EnhancementsFeature Infrastructure Ports per Ficon Link Incident ReportingOSA-Express2 availability OSA-Express3 Ethernet features Summary of benefitsOSA-Express3 10 Gigabit Ethernet LR FeaturesPurpose/Traffic TypeOSA-Express3-2P 1000BASE-T Ethernet OSA-Express3-2P Gigabit Ethernet SXFour-port exploitation on OSA-Express3 GbE SX and LX OSA-Express3 1000BASE-T EthernetNetwork Traffic Analyzer Dynamic LAN idle for z/OS Link aggregation for z/VM in Layer 2 modeOSA Layer 3 Virtual MAC for z/OS Layer 2 transport mode When would it be used?OSA-Express3 and OSA-Express2 OSN OSA for NCP Direct Memory Access DMAHardware data router IBM Communication Controller for Linux CCLRemove L2/L3 LPAR-to-LPAR Restriction OSA Integrated Console ControllerOSA/SF Virtual MAC and Vlan id Display Capability HiperSockets HiperSockets Enhancement for zIIP Exploitation Can Do IT securely Security CryptographyCP Assist for Cryptographic Function Cpacf Configurable Crypto Express2 Enhancements to CP Assist for Cryptographic Func Tion CpacfCrypto Express2-1P Secure Key AES Support for ISOSupport for RSA keys up to 4096 bits Dynamically add crypto to a logical partitionSmart Card Reader Support for 13- thru 19-digit Personal Account NumbersTKE 5.3 workstation Enhancement with TKE 5.3 LICRemote Key Loading Benefits TKE additional smart cards new featureSystem z10 BC cryptographic migration Remote Loading of Initial ATM KeysCapacity 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 RASRedundant I/O Interconnect Enhanced Driver MaintenanceAvailability Functions Hardware System Area HSATransparent Sparing Dynamic Oscillator SwitchoverConcurrent Memory Upgrade Service EnhancementsIBM Systems Director Active Energy Manager Power MonitoringPower Estimation Tool Environmental EnhancementsParallel Sysplex Cluster Technology Improved service time with Coupling Facility DuplexCoupling Facility Control Code Cfcc Level System-Managed CF Structure Duplexing Coupling Facility Configuration AlternativesIntroducing long reach InfiniBand coupling links Parallel Sysplex Coupling ConnectivityCoupling Connectivity for Parallel Sysplex Server Time Protocol enhancements Z10 Coupling Link OptionsTime synchronization and time accuracy on z10 BC Server Time Protocol STPPreview Improved STP System Management with Continuous Availability of NTP servers used as Exter Enhanced STP recovery when Internal Battery FeatureApplication Programming Interface API to automate Internal Battery Feature RecommendationHMC/SE Console Messenger HMC System SupportFamily Machine Type Internet Protocol, Version 6 IPv6HMC z/VM Tower System Management Enhancements Enhanced installation support for z/VM using the HMCImplementation Services for Parallel Sysplex Gdps Fiber Quick Connect for Ficon LX EnvironmentsPhysical Planning Z10 BC Physical CharacteristicsZ10 BC System Power Z10 BC Highlights and Physical Dimensions Z9 BCZ10 BC Concurrent PU Conversions Z10 BC Configuration DetailZ10 BC IBF hold uptime Drawer Drawers Z10 BC Model StructureZ10 BC Minimum Maximum IBFZ890 Coupling Facility CF Level of SupportStatement of Direction Resource Link PublicationsFollowing Redbook publications are available now Available in the Library section of Resource LinkZSO03021-USEN-02
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