HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

Cluster Object Manager Daemon: cmomd.......................................................................42
Cluster SNMP Agent Daemon: cmsnmpd..........................................................................42
Generic Resource Assistant Daemon: cmresourced.............................................................42
Service Assistant Daemon: cmserviced.............................................................................43
Quorum Server Daemon: qs...........................................................................................43
Network Manager Daemon: cmnetd................................................................................43
Lock LUN Daemon: cmdisklockd......................................................................................43
Utility Daemon: cmlockd................................................................................................43
Cluster WBEM Agent Daemon: cmwbemd........................................................................43
Proxy Daemon: cmproxyd..............................................................................................44
CFS Components..........................................................................................................44
How the Cluster Manager Works .............................................................................................44
Configuring the Cluster ......................................................................................................44
Heartbeat Messages .........................................................................................................45
Manual Startup of Entire Cluster ..........................................................................................45
Automatic Cluster Startup ...................................................................................................46
Dynamic Cluster Re-formation .............................................................................................46
Cluster Quorum to Prevent Split-Brain Syndrome.....................................................................46
Cluster Lock ......................................................................................................................46
Lock Requirements.........................................................................................................47
Use of a Lock LUN or LVM Lock Disk as the Cluster Lock..........................................................47
Single Lock Disk or LUN.................................................................................................48
Dual Lock Disk..............................................................................................................48
Use of the Quorum Server as the Cluster Lock........................................................................48
No Cluster Lock ................................................................................................................49
What Happens when You Change the Quorum Configuration Online.......................................49
How the Package Manager Works...........................................................................................50
Package Types...................................................................................................................50
Non-failover Packages...................................................................................................50
Failover Packages..........................................................................................................50
Configuring Failover Packages ..................................................................................51
Deciding When and Where to Run and Halt Failover Packages .....................................51
Failover Packages’ Switching Behavior.........................................................................51
Failover Policy..........................................................................................................53
Automatic Rotating Standby.......................................................................................53
Failback Policy.........................................................................................................55
Using Older Package Configuration Files..............................................................................57
Using the Generic Resources Monitoring Service....................................................................57
Using the Event Monitoring Service .....................................................................................59
Using the EMS HA Monitors................................................................................................59
How Packages Run.................................................................................................................60
What Makes a Package Run?..............................................................................................60
Before the Control Script Starts.............................................................................................61
During Run Script Execution.................................................................................................62
Normal and Abnormal Exits from the Run Script.....................................................................63
Service Startup with cmrunserv............................................................................................63
While Services are Running................................................................................................63
When a Service, Subnet, or Monitored Resource Fails, or a Dependency is Not Met..................64
When a Package is Halted with a Command........................................................................64
During Halt Script Execution................................................................................................64
Normal and Abnormal Exits from the Halt Script....................................................................66
Package Control Script Error and Exit Conditions...............................................................66
How the Network Manager Works ..........................................................................................67
Stationary and Relocatable IP Addresses ..............................................................................67
Types of IP Addresses....................................................................................................68
4 Contents