Managing HP Serviceguard for Linux, Tenth Edition, September 2012

Cluster WBEM Agent Daemon: cmwbemd.......................................................37
Proxy Daemon: cmproxyd..............................................................................37
How the Cluster Manager Works ............................................................................37
Configuration of the Cluster ................................................................................37
Heartbeat Messages .........................................................................................38
Manual Startup of Entire Cluster..........................................................................39
Automatic Cluster Startup ...................................................................................39
Dynamic Cluster Re-formation .............................................................................39
Cluster Quorum to Prevent Split-Brain Syndrome.....................................................40
Cluster Lock......................................................................................................40
Use of a Lock LUN as the Cluster Lock..................................................................40
Use of the Quorum Server as a Cluster Lock..........................................................41
No Cluster Lock ................................................................................................43
What Happens when You Change the Quorum Configuration Online.......................43
How the Package Manager Works...........................................................................44
Package Types...................................................................................................44
Non-failover Packages...................................................................................44
Failover Packages.........................................................................................45
Configuring Failover Packages ..................................................................45
Deciding When and Where to Run and Halt Failover Packages .....................46
Failover Packages’ Switching Behavior........................................................46
Failover Policy..........................................................................................48
Automatic Rotating Standby.......................................................................49
Failback Policy.........................................................................................52
On Combining Failover and Failback Policies...............................................55
Using the Generic Resources Monitoring Service....................................................55
Using Older Package Configuration Files..............................................................57
How Packages Run.................................................................................................58
What Makes a Package Run?..............................................................................58
Before the Control Script Starts............................................................................60
During Run Script Execution.................................................................................61
Normal and Abnormal Exits from the Run Script.....................................................63
Service Startup with cmrunserv............................................................................63
While Services are Running................................................................................64
When a Service or Subnet Fails, or a Dependency is Not Met.................................64
When a Package is Halted with a Command........................................................64
During Halt Script Execution................................................................................65
Normal and Abnormal Exits from the Halt Script....................................................67
Package Control Script Error and Exit Conditions...............................................67
How the Network Manager Works ..........................................................................68
Stationary and Relocatable IP Addresses and Monitored Subnets.............................68
Types of IP Addresses.........................................................................................70
Adding and Deleting Relocatable IP Addresses .....................................................70
Load Sharing ...............................................................................................70
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