Updated: 11 December 1998

Guidelines for OpenVMS Cluster Configurations

Chapter 10
10	Configuring OpenVMS Clusters for Scalability
10.1	What Is Scalability?
10.1.1	Scalable Dimensions
10.2	Strategies for Configuring a Highly Scalable OpenVMS Cluster
10.2.1	Scalability Strategies
10.3	Scalability in CI OpenVMS Clusters
10.3.1	Two-Node CI OpenVMS Cluster
10.3.2	Three-Node CI OpenVMS Cluster
10.3.3	Seven-Node CI OpenVMS Cluster
10.3.4	Guidelines for CI OpenVMS Clusters
10.3.5	Guidelines for Volume Shadowing in CI OpenVMS Clusters
10.4	Scalability in DSSI OpenVMS Clusters
10.4.1	Two-Node DSSI OpenVMS Cluster
10.4.2	Four-Node DSSI OpenVMS Cluster with Shared Access
10.4.3	Four-Node DSSI OpenVMS Cluster with Some Nonshared Access
10.5	Scalability in MEMORY CHANNEL OpenVMS Clusters
10.5.1	Two-Node MEMORY CHANNEL Cluster
10.5.2	Three-Node MEMORY CHANNEL Cluster
10.5.3	Four-Node MEMORY CHANNEL OpenVMS Cluster
10.6	Scalability in SCSI OpenVMS Clusters
10.6.1	Two-Node Fast-Wide SCSI Cluster
10.6.2	Two-Node Fast-Wide SCSI Cluster with HSZ Storage
10.6.3	Three-Node Fast-Wide SCSI Cluster
10.6.4	Four-Node Ultra SCSI Hub Configuration
10.7	Scalability in OpenVMS Clusters with Satellites
10.7.1	Six-Satellite OpenVMS Cluster
10.7.2	Six-Satellite OpenVMS Cluster with Two Boot Nodes
10.7.3	Twelve-Satellite LAN OpenVMS Cluster with Two LAN Segments
10.7.4	Forty-Five Satellite OpenVMS Cluster with FDDI Ring
10.7.5	High-Powered Workstation OpenVMS Cluster
10.7.6	Guidelines for OpenVMS Clusters with Satellites
10.7.7	Extended LAN Configuration Guidelines
10.7.8	System Parameters for OpenVMS Clusters
10.8	Scaling for I/Os
10.8.1	MSCP Served Access to Storage
10.8.2	Disk Technologies
10.8.3	Read/Write Ratio
10.8.4	I/O Size
10.8.5	Caches
10.8.6	Managing "Hot" Files
10.8.7	Volume Shadowing
Chapter 11
11	OpenVMS Cluster System Management Strategies
11.1	Simple and Complex Configurations
11.2	System Disk Strategies
11.2.1	Single System Disk
11.2.2	Multiple System Disks
11.2.3	Multiple System-Disk OpenVMS Cluster
11.2.4	Dividing an OpenVMS Cluster System
11.2.5	Summary: Single Versus Multiple System Disks
11.3	OpenVMS Cluster Environment Strategies
11.3.1	Common Environment
11.3.2	Putting Environment Files on a Separate, Common Disk
11.3.3	Multiple Environments
11.4	Additional Multiple-Environment Strategies
11.4.1	Using Multiple SYSUAF.DAT Files
11.4.2	Using Multiple Queue Managers
11.5	Quorum Strategies
11.5.1	Quorum Strategy Options
11.6	State Transition Strategies
11.6.1	Dealing with State Transitions
11.7	Migration and Warranted Support for Multiple Versions
11.8	Alpha and VAX Systems in the Same OpenVMS Cluster
11.8.1	OpenVMS Cluster Satellite Booting Across Architectures
11.8.2	Restrictions
11.9	Determining Backup and Storage Management Strategies
11.9.1	Steps for Determining a Backup Strategy
11.10	Disk Backup
11.11	Tape Backup
11.11.1	For More Information
11.11.2	Benefits of Unattended Backup
11.11.3	Archive/Backup System for OpenVMS
11.11.4	StorageTek 4400 ACS
11.11.5	Tape-Drive Performance and Capacity
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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