Managing HP Serviceguard A.11.20.20 for Linux, May 2013

3.5.9 Package Switching and Relocatable IP Addresses..........................................................69
3.5.10 Address Resolution Messages after Switching on the Same Subnet .................................70
3.5.11 VLAN Configurations................................................................................................70
3.5.11.1 What is VLAN?.................................................................................................70
3.5.11.2 Support for Linux VLAN......................................................................................70
3.5.11.3 Configuration Restrictions....................................................................................70
3.5.11.4 Additional Heartbeat Requirements......................................................................71
3.6 Volume Managers for Data Storage....................................................................................71
3.6.1 Storage on Arrays......................................................................................................71
3.6.2 Monitoring Disks.......................................................................................................72
3.6.3 More Information on LVM...........................................................................................72
3.7 About Persistent Reservations..............................................................................................72
3.7.1 Rules and Limitations..................................................................................................73
3.7.2 How Persistent Reservations Work................................................................................74
3.8 Responses to Failures ........................................................................................................75
3.8.1 Reboot When a Node Fails .......................................................................................75
3.8.1.1 What Happens when a Node Times Out...............................................................75
3.8.1.1.1 Example .....................................................................................................76
3.8.2 Responses to Hardware Failures .................................................................................76
3.8.3 Responses to Package and Service Failures ..................................................................77
3.8.4 Responses to Package and Generic Resources Failures...................................................77
3.8.4.1 Service Restarts .................................................................................................78
3.8.4.2 Network Communication Failure .........................................................................78
4 Planning and Documenting an HA Cluster ..................................................79
4.1 General Planning .............................................................................................................79
4.1.1 Serviceguard Memory Requirements.............................................................................79
4.1.2 Planning for Expansion ..............................................................................................79
4.2 Using Serviceguard with Virtual Machines...........................................................................80
4.2.1 Rules and Restrictions.................................................................................................80
4.2.2 Supported cluster configuration options........................................................................81
4.3 Hardware Planning ..........................................................................................................81
4.3.1 SPU Information ........................................................................................................81
4.3.2 LAN Information ......................................................................................................81
4.3.3 Shared Storage.........................................................................................................82
4.3.3.1 FibreChannel.....................................................................................................82
4.3.3.2 iSCSI...............................................................................................................82
4.3.3.3 Multipath for Storage ........................................................................................82
4.3.4 Disk I/O Information ................................................................................................83
4.3.5 Hardware Configuration Worksheet ............................................................................83
4.4 Power Supply Planning .....................................................................................................84
4.4.1 Power Supply Configuration Worksheet .......................................................................84
4.5 Cluster Lock Planning........................................................................................................84
4.5.1 Cluster Lock Requirements...........................................................................................85
4.5.2 Planning for Expansion..............................................................................................85
4.5.3 Using a Quorum Server.............................................................................................85
4.5.3.1 Quorum Server Worksheet .................................................................................85
4.6 Volume Manager Planning ................................................................................................85
4.6.1 Volume Groups and Physical Volume Worksheet............................................................86
4.7 Cluster Configuration Planning ..........................................................................................86
4.7.1 Easy Deployment: cmpreparecl....................................................................................86
4.7.2 Heartbeat Subnet and Cluster Re-formation Time ..........................................................88
4.7.3 About Hostname Address Families: IPv4-Only, IPv6-Only, and Mixed Mode......................88
4.7.3.1 What Is IPv4–only Mode?...................................................................................88
Contents 5