Veritas Storage Foundation 5.0.1 Cluster File System Administrator's Guide Extracts for the HP Serviceguard Storage Management Suite on HP-UX 11i v3

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Table of Contents

Preface.................................................................................................................................7

Publishing History..................................................................................................................................7

1 Technical Overview........................................................................................................9

Overview of Cluster File System Architecture.......................................................................................9

Cluster File System Design................................................................................................................9

Cluster File System Failover............................................................................................................10

Group Lock Manager.......................................................................................................................10

VxFS Functionality on Cluster File Systems.........................................................................................10

Supported Features..........................................................................................................................10

Unsupported Features.....................................................................................................................11

Benefits and Applications.....................................................................................................................12

Advantages To Using CFS...............................................................................................................12

When To Use CFS............................................................................................................................12

2 Cluster File System Architecture..................................................................................15

Role of Component Products................................................................................................................15

Cluster Communication..................................................................................................................15

Membership Ports............................................................................................................................15

Veritas™ Cluster Volume Manager Functionality..........................................................................15

About CFS.............................................................................................................................................16

Cluster File System and The Group Lock Manager........................................................................16

Asymmetric Mounts........................................................................................................................16

Parallel I/O.......................................................................................................................................17

Cluster File System Backup Strategies............................................................................................17

Synchronizing Time on Cluster File Systems..................................................................................18

Distributing Load on a Cluster .......................................................................................................18

File System Tuneables......................................................................................................................18

Single Network Link and Reliability...............................................................................................18

I/O Error Handling Policy...............................................................................................................19

About Veritas Cluster Volume Manager Functionality........................................................................19

Private and Shared Disk Groups.....................................................................................................20

Activation Modes for Shared Disk Groups.....................................................................................21

Connectivity Policy of Shared Disk Groups....................................................................................22

Limitations of Shared Disk Groups.................................................................................................22

3 Cluster File System Administration..............................................................................23

Cluster Messaging - GAB......................................................................................................................23

Cluster Communication - LLT..............................................................................................................24

Volume Manager Cluster Functionality Overview..............................................................................24

Cluster File System Overview...............................................................................................................24

Number of parallel fsck threads to run during recovery is tunable...............................................24

Setting the number of parallel fsck threads...............................................................................24

Cluster and Shared Mounts.............................................................................................................24

Cluster File System Primary and Cluster File System Secondary...................................................25

Asymmetric Mounts........................................................................................................................25

Cluster File System Administration......................................................................................................25

Cluster File System Commands......................................................................................................25

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