HP UX Serviceguard Storage Management Software manual Technical Overview

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Technical Overview

This chapter includes the following topics:

•“Overview of Cluster File System Architecture” on page 8

•“VxFS Functionality on Cluster File Systems” on page 9

•“Benefits and Applications” on page 12

HP Serviceguard Storage Management Suite (SG SMS) bundles provide several options for clustering and storage. The information in this document applies to the SG SMS bundles that include the Veritas Storage Foundation™ 5.0 Cluster File System and Cluster Volume Manager by Symantec:

•SG SMS version A.02.00 bundles T2775CA, T2776CA, and T2777CA for HP-UX 11i v2

•SG SMS version A.02.00 Mission Critical Operating Environment (MCOE) bundles T2795CA, T2796CA, and T2797CA for HP-UX 11i v2

•SG SMS version A.02.00 bundles T2775CB, T2776CB, and T2777CB for HP-UX 11i v3

•SG SMS version A.02.00 High Availability Operating Environment (HAOE) bundles T8685CB, T8686CB, and T8687CB for HP-UX 11i v3

•SG SMS version A.02.00 Data Center Operating Environment (DCOE) bundles T8695CB, T8696CB, and T8697CB for HP-UX 11i v3

SG SMS bundles that include the Veritas Storage Foundation Cluster File System (CFS) allow clustered servers running HP-UX 11i to mount and use the same file system simultaneously, as if all applications using the file system are running on the same server. SG SMS bundles that include CFS also include the Veritas Storage Foundation Cluster Volume Manager (CVM). CVM makes logical volumes and raw device applications accessible throughout a cluster.

As SG SMS components, CFS and CVM are integrated with HP Serviceguard to form a highly available clustered computing environment. SG SMS bundles that include CFS and CVM do not include the Veritas™ Cluster Server by

Symantec (VCS). VCS functions that are required in an SG SMS environment are performed by Serviceguard. This document focuses on CFS and CVM administration in an SG SMS environment.

For more information on bundle features, options and applications, see the Application Use Cases for the HP Serviceguard Storage Management Suite White Paper and the HP Serviceguard Storage Management Suite Release Notes at:

http://www.docs.hp.com - select “High Availability”, then select “HP Serviceguard Storage Management Suite”

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Contents Second Edition Legal Notices Contents Troubleshooting Cluster Volume Manager AdministrationPrinting History Printing HistoryPage Technical Overview Group Lock Manager Overview of Cluster File System ArchitectureCluster File System Design Cluster File System FailoverCFS Supported Features Supported FeaturesVxFS Functionality on Cluster File Systems CFS Unsupported Features Unsupported FeaturesCFS Unsupported Features Benefits and Applications Advantages To Using CFSWhen To Use CFS Benefits and Applications Chapter Cluster File System Architecture Membership Ports Veritas Cluster Volume Manager FunctionalityRole of Component Products Cluster CommunicationCluster File System and The Group Lock Manager About CFSAsymmetric Mounts Primary and Secondary Mount Options Parallel I/OCluster File System Backup Strategies File System Tuneables Error Handling PolicySynchronizing Time on Cluster File Systems Distributing Load on a ClusterExample of a Four-Node Cluster About Veritas Cluster Volume Manager FunctionalityPrivate and Shared Disk Groups Activation Modes for Shared Disk Groups Activation Modes for Shared Disk GroupsAllowed and conflicting activation modes Connectivity Policy of Shared Disk GroupsLimitations 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 OverviewAsymmetric Mounts Cluster File System Commands Cluster File System AdministrationDistributing the Load on a Cluster Time Synchronization for Cluster File SystemsGrowing a Cluster File System Fstab fileCluster 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 PolicyRecovery in a CVM Environment Troubleshooting Resource Temporarily Unavailable Installation IssuesInaccessible System Incorrect Permissions for Root on Remote SystemInstallation Issues Unmount Failures Cluster File System ProblemsMount Failures Performance Issues Command FailuresHigh Availability Issues Cluster File System Problems Appendix a
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