After you have configured your Linux FailSafe system and run diagnostic tests on its components, you can activate the highly available services by starting Linux FailSafe. You can start Linux FailSafe on a systemwide basis, on all of the nodes in a cluster, or on a specified node only.
| Caution |
When you start HA services on a subset of the nodes, you should make sure that resource groups are not running in other nodes in the cluster. For example, if a cluster contains nodes N1, N2, and N3 and HA services are started on nodes N1 and N2 but not on node N3, you should make sure that resource groups are not running on node N3. Linux FailSafe will not perform exclusivity checks on nodes where HA services are not started. |
When you start HA services, the following actions are performed:
All nodes in the cluster in the CDB are enabled
Linux FailSafe returns success to the user after modifying the CDB
The local CMOND gets notification from cdbd
The local CMOND starts all HA processes (CMSD, GCD, SRMD, FSD) and IFD.
CMOND sets failsafe2 chkconfig flag to on.
To start Linux FailSafe services using the Cluster Manager GUI, perform the following steps:
On the left side of the display, click on the “Nodes & Cluster” category.
On the right side of the display click on the “Start FailSafe HA Services” task link to launch the task.
Enter the selected inputs.
Click on “OK” at the bottom of the screen to complete the task.
To activate Linux FailSafe in a cluster, use the following command:
cmgr> start ha_services [on node A] [for cluster B] |