HP UX Serviceguard Storage Management Software manual Cluster Communication LLT

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Cluster File System Administration

Cluster Communication - LLT

Cluster Communication - LLT

LLT provides kernel-to-kernel communications and monitors network communications. The LLT files /etc/llthosts and /etc/llttab can be configured to set system IDs within a cluster, set cluster IDs for multiple clusters, and tune network parameters such as heartbeat frequency. LLT is implemented so events such as state changes are reflected quickly, which in turn enables fast responses.

LLT is automatically configured initially when Serviceguard is installed, and LLT is also automatically configured each time the CFS package is started.

See the llttab(4) manual page.

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Chapter 3

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Contents Second Edition Legal Notices Contents Cluster Volume Manager Administration TroubleshootingPrinting History Printing HistoryPage Technical Overview Cluster File System Failover Overview of Cluster File System ArchitectureCluster File System Design Group Lock ManagerSupported Features CFS Supported FeaturesVxFS Functionality on Cluster File Systems Unsupported Features CFS Unsupported FeaturesCFS Unsupported Features Advantages To Using CFS Benefits and ApplicationsWhen To Use CFS Benefits and Applications Chapter Cluster File System Architecture Cluster Communication Veritas Cluster Volume Manager FunctionalityRole of Component Products Membership PortsAbout CFS Cluster File System and The Group Lock ManagerAsymmetric Mounts Parallel I/O Primary and Secondary Mount OptionsCluster File System Backup Strategies Distributing Load on a Cluster Error Handling PolicySynchronizing Time on Cluster File Systems File System TuneablesAbout Veritas Cluster Volume Manager Functionality Example of a Four-Node ClusterPrivate and Shared Disk Groups Activation Modes for Shared Disk Groups Activation Modes for Shared Disk GroupsConnectivity Policy of Shared Disk Groups Allowed and conflicting activation modesLimitations 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 File System Overview Cluster and Shared MountsAsymmetric Mounts Cluster File System Administration Cluster File System CommandsFstab file Time Synchronization for Cluster File SystemsGrowing a Cluster File System Distributing the Load on a ClusterCluster File System Administration Performance Considerations Cluster Snapshot CharacteristicsSnapshots for Cluster File Systems Creating a Snapshot on a Cluster File System# 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 Disk Group Failure Policy Behavior of Master Node for Different Failure PoliciesRecovery in a CVM Environment Troubleshooting Incorrect Permissions for Root on Remote System Installation IssuesInaccessible System Resource Temporarily UnavailableInstallation Issues Cluster File System Problems Unmount FailuresMount Failures Command Failures Performance IssuesHigh Availability Issues Cluster File System Problems Appendix a