When Forced switch request (Forced startup) of an application is issued, RMS overrides all safety checks and starts the application. So if shared resources which require exclusive control between nodes become Online on the multiple nodes simultaneously, it could result in data corruption or other inconsistencies.
Note
RMS may kill the node on which RMS is not running before starting the application to reduce the risk of data corruption when the Forced startup of an application is issued.
To perform forced startup of an application safely, check whether RMS is running on all nodes in the cluster before starting forced startup according to the following procedure, and if there are the nodes on which RMS is not running, then shut down the nodes.
Check the node state by one of the following methods:
Execute the cftool -n command on all nodes.
fuji2# cftool -n Node Number State Os Cpu fuji2 1 UP Linux Pentium fuji3 2 UP Linux Pentium
Check the CF tree of the Cluster Admin.
. Check the following contents for the node states, and take corrective actions if necessary:
Check the node states are all UP.
If a LEFTCLUSTER node exists, recover CF from the LEFTCLUSTER state.
For details, see "PRIMECLUSTER Cluster Foundation Configuration and Administration."
If a node with DOWN or UNKNOWN exists, or if a node for which the state is not displayed exists, check whether the operating system of the node has stopped. If the operating system is running, shut down the operating system or restart the system in single-user mode.
Check whether some nodes on which RMS is not running exist among the nodes on which cluster applications will be forcibly started by one of the following methods:
Execute the hvdisp -a command on nodes where cluster applications will be started and check that the state of objects whose Type is SysNode is Online.
fuji2# hvdisp -a Local System: fuji2RMS Configuration: /opt/SMAW/SMAWRrms/build/config.us Resource Type HostName State StateDetails ----------------------------------------------------------------------------- fuji3RMS SysNode Online fuji2RMS SysNode Online app2 userApp Offline Machine001_app2 andOp fuji3RMS Machine000_app2 andOp fuji2RMS Offline ManageProgram000_Cmd_APP2 gRes Offline app1 userApp Offline Machine001_app1 andOp fuji3RMS Machine000_app1 andOp fuji2RMS Offline ManageProgram000_Cmd_APP1 gRes Offline
Check that the states of all SysNode displayed in the RMS tree of the Cluster Admin are Online.
If nodes which satisfy the following conditions exist, shut down the operating system of the nodes, or restart the system in single-user mode.
The node state is UP, and
The state of SysNode is not Online.
Execute the Forced switch (hvswitch -f) to forcibly start the application.
