Sysplex vs lpar
In 1990, IBM mainframe computers introduced the concept of a Systems Complex, commonly called a Sysplex, with MVS/ESA SPV4.1 in 1990. This allows authorized components in up to eight LPARs to communicate and cooperate with each other using the XCF protocol. z/OS Parallel Sysplex Update 12 CFLEVEL 19 - DYNDISP Comparisons CF Polling Dynamic CF Dispatching Coupling Thin Interrupts DYNDISP= NO DYNDISP= YES DYNDISP= THININTERRUPT LPAR Time slicing CF time-based algorithm for CF engine sharing CF releases shared engine if no work left to be done - CF does not “play nice” with other shared images International Technical Support Organization z/OS Parallel Sysplex Configuration Overview September 2006 SG24-6485-00 Sysplex LPARs on multiple CECs (typical). PR/SM initial capping (HardCap) Hard Cap - Can be used to control 4HRA costs White Space - wasted when no impact on CEC 4HRA Min Guaranteed (CEC MSUs * LPAR Weight %) Can't use with defined or group capacity More granular 1/10 of CP than # LPs MSU limit increases if other LPAR deactivated PR/SM Absolute Parallel Sysplex and describe their function B. List the factors that will impact the size of Coupling Facility storage needed in the Parallel Sysplex C. Examine tools and options for sizing a Coupling Facility D. Describe the reasons for using a stand-alone Coupling Facility vs. an LPAR between systems E. Understand dynamic CF expansion and IBM Software Group –Enterprise Networking Solutions Page 15 Sysplex Distribution –ServerWLM Crossover Cost Server-specific weights Comparison of displaceable capacity based on actual usage percentage of each processor by the workload Example: JAVA workload designed to use 10% CP 90% zAAP SUs Each LPAR has same displaceable capacity -1000 4 IBM Mainframe Bits: Understanding the Platform Hardware Scaling to meet demand Longer term trends that cause increases in demand for computing resources can be predicted. However, spikes in demand do occur, which cause the need to dynamicall logical partition (LPAR): A logical partition (LPAR) is the division of a computer's processor s, memory , and storage into multiple sets of resources so that each set of resources can be operated independently with its own operating system instance and application s.
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If you need to check if an LPAR is part of a SYSPLEX or the SYSPLEX name it belongs to simply issue the command: D XCF. Example: D XCF. Returns: RESPONSE=TST1 IXC334I 09.32.10 DISPLAY XCF 309 SYSPLEX TESTPLEX: TST1 TST2 TST3. Notes: the command was issued from LPAR TST1; in red we can see the SYSPLEX name (TESTPLEX) z/OS Parallel Sysplex Update 12 CFLEVEL 19 - DYNDISP Comparisons CF Polling Dynamic CF Dispatching Coupling Thin Interrupts DYNDISP= NO DYNDISP= YES DYNDISP= THININTERRUPT LPAR Time slicing CF time-based algorithm for CF engine sharing CF releases shared engine if no work left to be done - CF does not “play nice” with other shared images z/OS Parallel Sysplex Update 5 IBM z13 TM from a sysplex perspective • Up to 141 Coupling Facility processors • Any given CF LPAR can have at most 16 logical CP’s (no change) • 256 Coupling CHPIDs per CEC (up from 128) • At most 128 can be configured for given CF LPAR • CTN must be STP-Only (not mixed) • Does not support older IBM, z/OS, Predictive Failure Analysis, DB2, Parallel Sysplex, Tivoli, RACF, System z, WebSphere, Language Environment, zSeries, CICS, System x, Dedicated vs. Shared CF Engines CFLP1 CFLP2 CFLP3 CFLP4 CFLP5 ICF ICF Dedicated Physical PR/SM LPAR and given to another CF LP • DCFD=YES: Sysplex Best Practices Frank Kyne Bert de Beer Luis Martinez Harriet Morril Miha Petric David Viguers Suzi Wendler Optimization of sysplex performance and availability Hints and tips for major subsystems Considerations for z/OS . International Technical Support Organization Specifies the name of a system that XCF is to remove from the sysplex.
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Simply put, sysplex is a way of making multiple systems work together as a team and this can be LPARs on one physical box, or it can be spread out across many. Before we get into exactly how it does this. 6 TCPIP SYSPLEX Distribution– DYNAMIC VIPA(s) & Their Interrelations • VIPA Evolution: • IP address availability in z/OS can be viewed as a progressive evolution.Static VIPA eliminated the problem of an IP address being associated with a single networking hardware point of failure. • Dynamic VIPA allows us to move such IP addresses in event of an application, TCP/IP stack, or CF, such as lock, cache and list structure access. Each product (such as RACF, JES2, XCF, and so forth) is listed, and CP2000 models how … - Selection from OS/390 Parallel Sysplex Configuration, Volume 2: Cookbook [Book] Side-by-side comparison of IBM Parallel Sysplex and SAP Internet Transaction Server (ITS).
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Figure 8-10 High availability WebSphere in a sysplex configuration, This high availability WebSphere configuration on z/OS requires a Parallel Sysplex environment plus the following setups within and outside the Parallel Sysplex. Setup outside the Parallel Sysplex includes: Redundant network path leading to the Web servers and application servers. Various WebSphere configurations are possible in a Parallel Sysplex environment, as shown in Figure 8-4. Figure 8-4 WebSphere for z/OS in a sysplex A WebSphere cell can span across multiple LPARs with one Deployment Manager that resides on one of the LPARs. LPAR en mainframes de IBM están certificados como Common Criteria EAL5, lo que los hace equiparables a equipos separados físicamente, sin interconexión alguna, así que son apropiados para los más altos requisitos de seguridad, incluidos los de uso militar. Note: The Parallel Sysplex Coupling Facility can run either as a separate LPAR or within a dedicated hardware device.
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Basically what MVS wanted. Delta between LPAR Busy % and MVS Busy % is usually due to capping The Sysplex have 2 CECs where another CEC doesn't have major performance/capacity issues. We planned to better balance the CPU consumption between the CECs to improve the LPAR performance and zOS WLM “decision making”(Sysplex vs… A critical LPAR, which has been capacity constrained due to the CEC high CPU utilization. Quote: Initially, one member of the MAS must do a cold start, other members are added, deleted, or changed on a warm start. As each new member is warm started and initialized, all other members of the MAS are made aware of its existence because each member shares the same spool volumes and checkpoint data sets and communicates through the JES common coupling services (JES XCF). Parallel Sysplex: Joining systems through a coupling facility (CF) LPAR (connecting/coupling happens through a special type of system/LPAR). Monoplex: An option (customized during system start up) used for stand alone systems to use Sysplex Services within the system.