HP UX Serviceguard Storage Management Software instruction

Cluster File System Administration

Volume Manager Cluster Functionality Overview

Volume Manager Cluster Functionality Overview

The Veritas™ Cluster Volume Manager (CVM) component of the Veritas™ Volume Manager by Symantec (VxVM) allows multiple hosts to concurrently access and manage a given set of logical devices under VxVM control. A VxVM cluster is a set of hosts sharing a set of devices; each host is a node in the cluster. The nodes are connected across a network. If one node fails, other nodes can still access the devices. CVM presents the same logical view of device configurations and changes on all nodes.

You configure CVM shared storage after HP Serviceguard sets up a cluster configuration.

See “Cluster File System Administration” on page 34.

Chapter 3

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HP UX Serviceguard Storage Management Software manual Volume Manager Cluster Functionality Overview

Contents

Second Edition Legal Notices Contents Troubleshooting Cluster Volume Manager Administration Printing History Printing HistoryPage Technical Overview Group Lock Manager Overview of Cluster File System ArchitectureCluster File System Design Cluster File System Failover CFS Supported Features Supported FeaturesVxFS Functionality on Cluster File Systems CFS Unsupported Features Unsupported Features CFS Unsupported Features Benefits and Applications Advantages To Using CFS When To Use CFS Benefits and Applications Chapter Cluster File System Architecture Membership Ports Veritas Cluster Volume Manager FunctionalityRole of Component Products Cluster Communication Cluster File System and The Group Lock Manager About CFSAsymmetric Mounts Primary and Secondary Mount Options Parallel I/O Cluster File System Backup Strategies File System Tuneables Error Handling PolicySynchronizing Time on Cluster File Systems Distributing Load on a Cluster Example of a Four-Node Cluster About Veritas Cluster Volume Manager Functionality Private and Shared Disk Groups Activation Modes for Shared Disk Groups Activation Modes for Shared Disk Groups Allowed and conflicting activation modes Connectivity Policy of Shared Disk Groups Limitations of Shared Disk Groups About Veritas Cluster Volume Manager Functionality Chapter Cluster File System Administration Cluster File System Administration Cluster Messaging GAB Cluster Communication LLT Volume Manager Cluster Functionality Overview Cluster and Shared Mounts Cluster File System Overview Asymmetric Mounts Cluster File System Commands Cluster File System Administration Distributing the Load on a Cluster Time Synchronization for Cluster File SystemsGrowing a Cluster File System Fstab file Cluster File System Administration Creating a Snapshot on a Cluster File System Cluster Snapshot CharacteristicsSnapshots for Cluster File Systems Performance Considerations # cfsumount /mnt1snap Cluster Volume Manager Overview of Cluster Volume Management Example of a 4-Node Cluster Disk group activation mode restrictions Either of the write modes on other nodes will fail # cfsdgadm display Behavior of Master Node for Different Failure Policies Disk Group Failure Policy Recovery in a CVM Environment Troubleshooting Resource Temporarily Unavailable Installation IssuesInaccessible System Incorrect Permissions for Root on Remote System Installation Issues Unmount Failures Cluster File System ProblemsMount Failures Performance Issues Command FailuresHigh Availability Issues Cluster File System Problems Appendix a