Document revision date: 30 March 2001

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	Configuration Requirements and Restrictions
6.3	HSx Failover Modes
6.3.1	Transparent Failover Mode
6.3.2	Multibus Failover Mode
6.3.3	Port Addressing for Controllers in Multibus Mode
6.4	Parallel SCSI Multipath Configurations
6.4.1	Transparent Failover
6.4.2	Multibus Failover and Multiple Paths
6.4.3	Configurations Using Multiported Storage Controllers
6.5	Device Naming for Parallel SCSI Multipath Configurations
6.5.1	Review of Node Allocation Classes
6.5.2	Review of Port Allocation Classes
6.5.3	Device Naming Using HSZ Allocation Classes
6.6	Fibre Channel Multipath Configurations
6.7	Implementing Multipath Configurations
6.7.1	Valid Multipath Configurations
6.7.2	Invalid Multipath Configuration
6.7.3	Multipath System Parameters
6.7.4	Path Identifiers
6.7.5	Displaying Paths
6.7.5.1	Displaying Paths With SHOW DEVICE/FULL
6.7.5.2	Displaying Paths With SHOW DEVICE/MULTIPATH_SET
6.7.6	Path Polling
6.7.7	Switching Current Paths Manually
6.7.8	Path Selection by OpenVMS
6.7.9	How OpenVMS Performs Multipath Failover
6.7.10	Enabling or Disabling Paths as Path Switch Candidates
6.7.11	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 Support
7.2.1	Fibre Channel Remedial Kits
7.2.2	Mixed-Version and Mixed-Architecture Cluster Support
7.2.3	Fibre Channel and Volume Shadowing for OpenVMS
7.2.4	Fibre Channel and OpenVMS Galaxy Configurations
7.3	Example Configurations
7.3.1	Single Host with Dual-Ported Storage
7.3.2	Multiple Hosts With One Dual-Ported Storage Controller
7.3.3	Multiple Hosts With Storage Controller Redundancy
7.3.4	Multiple Hosts With Multiple Independent Switches
7.3.5	Multiple Hosts With Dual Fabrics
7.3.6	Multiple Hosts With Larger Fabrics
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 Disk Device Identification
7.5	Fibre Channel Tape Support (Alpha)
7.5.1	Minimum Hardware Configuration
7.5.2	Overview of Fibre Channel Tape Device Naming
7.5.2.1	Tape and Medium Changer Device Names
7.5.2.2	Use of Worldwide Identifiers (WWIDs)
7.5.2.3	File-Based Device Naming
7.5.3	New Commands and Features for Fibre Channel Tape Devices
7.5.4	Configuring a Fibre Channel Tape Device
7.5.4.1	Basic Configuration Steps: Summary
7.5.4.2	Basic Configuration Steps: Details
7.5.5	Changing the Name of an Existing Fibre Channel Tape Device
7.5.6	Moving a Physical Tape Device on Fibre Channel
7.5.7	Serving a Fibre Channel Tape Device
7.5.8	Replacing a Fibre Channel Tape Device
7.5.9	Determining the Physical Location of a Fibre Channel Tape Device
7.5.10	Accessing a Fibre Channel Tape Device in a Standalone Environment
7.5.11	Using an MDR with Dual Fibre Ports
7.6	Using the AlphaServer Console for Configuring FC
7.6.1	Viewing the FC Configuration from the Console
7.6.2	Setting Up FC Disks for Booting and Dumping
7.7	Setting Up an HSG for Use with OpenVMS
7.7.1	Setting a Dual HSG to Multibus Failover Mode
7.7.2	Setting an HSG to SCSI-3 Mode
7.7.3	Setting the Device Identifier for the CCL
7.7.4	Setting the HSG Port Parameters
7.7.5	Setting Up Logical Units on the HSG
7.7.6	Configuring the HSG Host Connections
7.8	Creating a Cluster with a Shared FC System Disk
7.9	Online Reconfiguration
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

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