Managing HP Serviceguard A.11.20.00 for Linux, June 2012

Use of the Quorum Server as a Cluster Lock..........................................................................33
No Cluster Lock ................................................................................................................34
What Happens when You Change the Quorum Configuration Online.......................................35
How the Package Manager Works...........................................................................................35
Package Types...................................................................................................................35
Non-failover Packages...................................................................................................35
Failover Packages..........................................................................................................36
Configuring Failover Packages ..................................................................................36
Deciding When and Where to Run and Halt Failover Packages .....................................36
Failover Packages’ Switching Behavior.........................................................................37
Failover Policy..........................................................................................................39
Automatic Rotating Standby.......................................................................................39
Failback Policy.........................................................................................................42
On Combining Failover and Failback Policies...............................................................45
Using the Generic Resources Monitoring Service....................................................................45
Using Older Package Configuration Files..............................................................................46
How Packages Run.................................................................................................................46
What Makes a Package Run?..............................................................................................47
Before the Control Script Starts.............................................................................................48
During Run Script Execution.................................................................................................49
Normal and Abnormal Exits from the Run Script.....................................................................50
Service Startup with cmrunserv............................................................................................50
While Services are Running................................................................................................51
When a Service or Subnet Fails or Generic Resource or a Dependency is Not Met.....................51
When a Package is Halted with a Command........................................................................51
During Halt Script Execution................................................................................................51
Normal and Abnormal Exits from the Halt Script....................................................................53
Package Control Script Error and Exit Conditions...............................................................53
How the Network Manager Works ..........................................................................................54
Stationary and Relocatable IP Addresses and Monitored Subnets.............................................54
Types of IP Addresses.........................................................................................................55
Adding and Deleting Relocatable IP Addresses .....................................................................55
Load Sharing ...............................................................................................................55
Bonding of LAN Interfaces .................................................................................................55
Bonding for Load Balancing................................................................................................57
Monitoring LAN Interfaces and Detecting Failure: Link Level.....................................................58
Monitoring LAN Interfaces and Detecting Failure: IP Level.......................................................58
Reasons To Use IP Monitoring.........................................................................................58
How the IP Monitor Works.............................................................................................59
Failure and Recovery Detection Times..........................................................................60
Constraints and Limitations.............................................................................................60
Reporting Link-Level and IP-Level Failures................................................................................61
Package Switching and Relocatable IP Addresses...................................................................61
Address Resolution Messages after Switching on the Same Subnet ...........................................62
VLAN Configurations..........................................................................................................62
What is VLAN?............................................................................................................62
Support for Linux VLAN..................................................................................................62
Configuration Restrictions...............................................................................................62
Additional Heartbeat Requirements.................................................................................63
Volume Managers for Data Storage..........................................................................................63
Storage on Arrays..............................................................................................................63
Monitoring Disks................................................................................................................64
More Information on LVM....................................................................................................64
About Persistent Reservations....................................................................................................64
Rules and Limitations..........................................................................................................65
4 Contents