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HP OpenVMS Systems Documentation
Content starts here Guidelines for OpenVMS Cluster Configurations

Guidelines for OpenVMS Cluster Configurations
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Chapter 9
9 Configuring OpenVMS Clusters for Scalability
     9.1     What Is Scalability?
         9.1.1         Scalable Dimensions
     9.2     Strategies for Configuring a Highly Scalable OpenVMS Cluster
         9.2.1         Scalability Strategies
         9.2.2         Three-Node Fast-Wide SCSI Cluster
         9.2.3         Four-Node Ultra SCSI Hub Configuration
     9.3     Scalability in OpenVMS Clusters with Satellites
         9.3.1         Six-Satellite OpenVMS Cluster
         9.3.2         Six-Satellite OpenVMS Cluster with Two Boot Nodes
         9.3.3         Twelve-Satellite LAN OpenVMS Cluster with Two LAN Segments
         9.3.4         Forty-Five Satellite OpenVMS Cluster with Intersite Link
         9.3.5         High-Powered Workstation OpenVMS Cluster (1995 Technology)
         9.3.6         High-Powered Workstation OpenVMS Cluster (2004 Technology)
         9.3.7         Guidelines for OpenVMS Clusters with Satellites
         9.3.8         Extended LAN Configuration Guidelines
         9.3.9         System Parameters for OpenVMS Clusters
     9.4     Scalability in a Cluster over IP
         9.4.1         Multiple node IP based Cluster System
         9.4.2         Guidelines for Configuring IP based Cluster
     9.5     Scaling for I/Os
         9.5.1         MSCP Served Access to Storage
         9.5.2         Disk Technologies
         9.5.3         Read/Write Ratio
         9.5.4         I/O Size
         9.5.5         Caches
         9.5.6         Managing "Hot" Files
         9.5.7         Volume Shadowing
Chapter 10
10 OpenVMS Cluster System Management Strategies
     10.1     Simple and Complex Configurations
     10.2     System Disk Strategies
         10.2.1         Single System Disk
         10.2.2         Multiple System Disks
         10.2.3         Multiple System-Disk OpenVMS Cluster
         10.2.4         Dividing an OpenVMS Cluster System
         10.2.5         Summary: Single Versus Multiple System Disks
     10.3     OpenVMS Cluster Environment Strategies
         10.3.1         Common Environment
         10.3.2         Putting Environment Files on a Separate, Common Disk
         10.3.3         Multiple Environments
     10.4     Additional Multiple-Environment Strategies
         10.4.1         Using Multiple SYSUAF.DAT Files
         10.4.2         Using Multiple Queue Managers
     10.5      Quorum Strategies
         10.5.1         Quorum Strategy Options
     10.6     State Transition Strategies
         10.6.1         Dealing with State Transitions
     10.7     Migration and Warranted Support for Multiple Versions
Appendix A
Appendix A SCSI as an OpenVMS Cluster Interconnect
     A.1     Conventions Used in This Appendix
         A.1.1         SCSI ANSI Standard
         A.1.2         Symbols Used in Figures
     A.2     Accessing SCSI Storage
         A.2.1         Single-Host SCSI Access in OpenVMS Cluster Systems
         A.2.2         Multihost SCSI Access in OpenVMS Cluster Systems
     A.3     Configuration Requirements and Hardware Support
         A.3.1         Configuration Requirements
         A.3.2         Hardware Support
     A.4     SCSI Interconnect Concepts
         A.4.1         Number of Devices
         A.4.2         Performance
         A.4.3         Distance
         A.4.4         Cabling and Termination
     A.5     SCSI OpenVMS Cluster Hardware Configurations
         A.5.1         Systems Using Add-On SCSI Adapters
             A.5.1.1             Building a Basic System Using Add-On SCSI Adapters
             A.5.1.2             Building a System with More Enclosures or Greater Separation or with HSZ Controllers
             A.5.1.3             Building a System That Uses Differential Host Adapters
     A.6     Installation
         A.6.1         Step 1: Meet SCSI Grounding Requirements
         A.6.2         Step 2: Configure SCSI Node IDs
             A.6.2.1             Configuring Device IDs on Multihost SCSI Buses
             A.6.2.2             Configuring Device IDs on Single-Host SCSI Buses
         A.6.3         Step 3: Power Up and Verify SCSI Devices
         A.6.4         Step 4: Show and Set SCSI Console Parameters
         A.6.5         Step 5: Install the OpenVMS Operating System
         A.6.6         Step 6: Configure Additional Systems
     A.7     Supplementary Information
         A.7.1         Running the OpenVMS Cluster Configuration Command Procedure
         A.7.2         Error Reports and OPCOM Messages in Multihost SCSI Environments
             A.7.2.1             SCSI Bus Resets
             A.7.2.2             SCSI Timeouts
             A.7.2.3             Mount Verify
             A.7.2.4             Shadow Volume Processing
             A.7.2.5             Expected OPCOM Messages in Multihost SCSI Environments
             A.7.2.6             Error Log Basics
             A.7.2.7             Error Log Entries in Multihost SCSI Environments
         A.7.3         Restrictions and Known Problems
         A.7.4         Troubleshooting
             A.7.4.1             Termination Problems
             A.7.4.2             Booting or Mounting Failures Caused by Incorrect Configurations
                 A.7.4.2.1                 Bugchecks During the Bootstrap Process
                 A.7.4.2.2                 Failure to Configure Devices
                 A.7.4.2.3                 Mount Failures
             A.7.4.3             Grounding
             A.7.4.4             Interconnect Lengths
         A.7.5         SCSI Arbitration Considerations
             A.7.5.1             Arbitration Issues in Multiple-Disk Environments
             A.7.5.2             Solutions for Resolving Arbitration Problems
             A.7.5.3             Arbitration and Bus Isolators
         A.7.6         Removal and Insertion of SCSI Devices While the OpenVMS Cluster System is Operating
             A.7.6.1             Terminology for Describing Hot Plugging
             A.7.6.2             Rules for Hot Plugging
             A.7.6.3             Procedures for Ensuring That a Device or Segment is Inactive
             A.7.6.4             Procedure for Hot Plugging StorageWorks SBB Disks
             A.7.6.5             Procedure for Hot Plugging HSZxx
             A.7.6.6             Procedure for Hot Plugging Host Adapters
             A.7.6.7             Procedure for Hot Plugging DWZZx Controllers
         A.7.7         OpenVMS Requirements for Devices Used on Multihost SCSI OpenVMS Cluster Systems
         A.7.8         Grounding Requirements

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