Updated: 11 December 1998

Guidelines for OpenVMS Cluster Configurations

Chapter 6
6	Configuring Multiple Paths to SCSI and Fibre Channel Storage
6.1	Overview of Multipath SCSI Support
6.1.1	Direct SCSI to Direct SCSI Failover
6.1.2	Direct SCSI to MSCP Served Failover
6.1.3	Configurations Combining Both Types of Multipath Failover
6.2	HSx Failover Modes
6.2.1	Transparent Failover Mode
6.2.2	Multibus Failover Mode
6.3	Path Selection by OpenVMS
6.3.1	How OpenVMS Performs Multipath Failover
6.4	Configuration Requirements and Restrictions
6.5	Parallel SCSI Multipath Configurations
6.5.1	Transparent Failover
6.5.2	Multibus Failover and Multiple Paths
6.5.3	Configurations Using Multiported Storage Controllers
6.6	Device Naming for Parallel SCSI Multipath Configurations
6.6.1	Review of Node Allocation Classes
6.6.2	Review of Port Allocation Classes
6.6.3	Device Naming Using HSZ Allocation Classes
6.7	Fibre Channel Multipath Configurations
6.8	Implementing Multipath Configurations
6.8.1	Valid Multipath Configurations
6.8.2	Invalid Multipath Configuration
6.8.3	Multipath System Parameters
6.8.4	Path Identifiers
6.8.5	Displaying Paths
6.8.5.1	Displaying Paths With SHOW DEVICE/FULL
6.8.5.2	Displaying Paths With SHOW DEVICE/MULTIPATH_SET
6.8.6	Path Polling
6.8.7	Switching Current Paths Manually
6.8.8	Enabling or Disabling Paths as Path Switch Candidates
6.8.9	Console Considerations
Chapter 7
7	Configuring Fibre Channel as an OpenVMS Cluster Storage Interconnect
7.1	Overview of Fibre Channel
7.2	Fibre Channel Configuration Requirements and Restrictions
7.3	Example Configurations
7.4	Fibre Channel Addresses, WWIDs, and Device Names
7.4.1	Fibre Channel Addresses and WWIDs
7.4.2	OpenVMS Names for Fibre Channel Devices
7.4.2.1	Fibre Channel Storage Adapter Names
7.4.2.2	Fibre Channel Path Names
7.4.2.3	Fibre Channel Storage Device Identification
Chapter 8
8	Configuring OpenVMS Clusters for Availability
8.1	Availability Requirements
8.2	How OpenVMS Clusters Provide Availability
8.2.1	Shared Access to Storage
8.2.2	Component Redundancy
8.2.3	Failover Mechanisms
8.2.4	Related Software Products
8.3	Strategies for Configuring Highly Available OpenVMS Clusters
8.3.1	Availability Strategies
8.4	Strategies for Maintaining Highly Available OpenVMS Clusters
8.4.1	Strategies for Maintaining Availability
8.5	Availability in a LAN OpenVMS Cluster
8.5.1	Components
8.5.2	Advantages
8.5.3	Disadvantages
8.5.4	Key Availability Strategies
8.6	Configuring Multiple LANs
8.6.1	Selecting MOP Servers
8.6.2	Configuring Two LAN Segments
8.6.3	Configuring Three LAN Segments
8.7	Availability in a DSSI OpenVMS Cluster
8.7.1	Components
8.7.2	Advantages
8.7.3	Disadvantages
8.7.4	Key Availability Strategies
8.8	Availability in a CI OpenVMS Cluster
8.8.1	Components
8.8.2	Advantages
8.8.3	Disadvantages
8.8.4	Key Availability Strategies
8.9	Availability in a MEMORY CHANNEL OpenVMS Cluster
8.9.1	Components
8.9.2	Advantages
8.9.3	Disadvantages
8.9.4	Key Availability Strategies
8.10	Availability in an OpenVMS Cluster with Satellites
8.10.1	Components
8.10.2	Advantages
8.10.3	Disadvantages
8.10.4	Key Availability Strategies
8.11	Multiple-Site OpenVMS Cluster System
8.11.1	Components
8.11.2	Advantages
8.12	Disaster-Tolerant OpenVMS Cluster Configurations
Chapter 9
9	Configuring CI OpenVMS Clusters for Availability and Performance
9.1	CI Components
9.2	Configuration Assumptions
9.3	Configuration 1
9.3.1	Components
9.3.2	Advantages
9.3.3	Disadvantages
9.3.4	Key Availability and Performance Strategies
9.4	Configuration 2
9.4.1	Components
9.4.2	Advantages
9.4.3	Disadvantages
9.4.4	Key Availability and Performance Strategies
9.5	Configuration 3
9.5.1	Components
9.5.2	Advantages
9.5.3	Disadvantages
9.5.4	Key Availability and Performance Strategies
9.6	Configuration 4
9.6.1	Components
9.6.2	Advantages
9.6.3	Disadvantages
9.6.4	Key Availability and Performance Strategies
9.7	Summary

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