Managing Serviceguard A.11.20, March 2013

Stationary and Relocatable IP Addresses ..............................................................................68
Types of IP Addresses....................................................................................................69
Adding and Deleting Relocatable IP Addresses .....................................................................69
Load Sharing ...............................................................................................................70
Monitoring LAN Interfaces and Detecting Failure: Link Level.....................................................70
Local Switching ............................................................................................................71
Switching Back to Primary LAN Interfaces after Local Switching...........................................73
Remote Switching .........................................................................................................74
Address Resolution Messages after Switching on the Same Subnet.......................................74
Monitoring LAN Interfaces and Detecting Failure: IP Level.......................................................74
Reasons To Use IP Monitoring.........................................................................................75
How the IP Monitor Works.............................................................................................75
Failure and Recovery Detection Times..............................................................................76
Constraints and Limitations.............................................................................................77
Reporting Link-Level and IP-Level Failures................................................................................77
Example 1: If Local Switching is Configured......................................................................77
Example 2: If There Is No Local Switching........................................................................78
Automatic Port Aggregation................................................................................................78
VLAN Configurations..........................................................................................................79
What is VLAN?............................................................................................................79
Support for HP-UX VLAN................................................................................................79
Configuration Restrictions...............................................................................................80
Additional Heartbeat Requirements.................................................................................80
Volume Managers for Data Storage..........................................................................................80
Types of Redundant Storage................................................................................................80
About Device File Names (Device Special Files).....................................................................81
Examples of Mirrored Storage.............................................................................................81
Examples of Storage on Disk Arrays.....................................................................................83
Types of Volume Manager..................................................................................................85
HP-UX Logical Volume Manager (LVM)..................................................................................85
Veritas Volume Manager (VxVM).........................................................................................85
Propagation of Disk Groups in VxVM..............................................................................85
Package Startup Time with VxVM....................................................................................85
Veritas Cluster Volume Manager (CVM)................................................................................86
Cluster Startup Time with CVM........................................................................................86
Propagation of Disk Groups with CVM.............................................................................86
Redundant Heartbeat Subnets.........................................................................................87
Comparison of Volume Managers........................................................................................87
iSCSI Storage and Persistent Reservations...................................................................................89
Rules and Limitations..........................................................................................................90
How Persistent Reservations Work........................................................................................90
Applying a Package......................................................................................................91
Running a Package........................................................................................................92
Distributing Persistent Reservation Keys on Extended Volume Groups..............................................92
Example...........................................................................................................................92
Responses to Failures..............................................................................................................93
System Reset When a Node Fails ........................................................................................93
What Happens when a Node Times Out.........................................................................93
Example..................................................................................................................94
Responses to Hardware Failures...........................................................................................94
Responses to Package and Service Failures ...........................................................................95
Responses to Package and Generic Resources Failures............................................................95
Service Restarts .................................................................................................................96
Network Communication Failure .........................................................................................96
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