19.3.2 Notes about configuration tasks and operations
Note the following when you configure and run NNMi for HA:
The OS user who runs NNMi must have the permissions needed to perform all cluster software operations. The OS user must be able to perform various operations using the cluster software, including creation of NNMi resources and starting and stopping resource groups.
Operations must be performed with the cluster software running. Various NNMi commands for HA configuration are used on the cluster software to perform processes, such as configuration and verification of configuration. If the cluster software is not running, these processes will result in an error.
If you restart the NNMi service using the procedure described in this manual and in the Release Notes, set NNMi in the maintenance mode in the cluster environment before restarting the NNMi service, unless instructed otherwise.
When you execute commands and edit local files, make sure that the NNMi resource group is online, unless instructed otherwise in the documentation.
Also make sure that failover will not occur within three minutes of a command's execution or of local file editing.
If a command is executed or a local file is edited while the resource group is offline and failover occurs within three minutes of that operation, the settings might be overwritten by the old configuration.
The NNMi resources assume that failover will occur in the event of a failure.
Configure NNMi to result in a failover if a failure occurs in the resource group; do not restart NNMi on the system resulting in a failure.
For details about the configuration method, see Help for the cluster software.
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In an environment that a failover is occurred by a failure, when you perform a failback, perform a failback after you recover all failures and stop all NNMi processes.
- In an HA environment, NNMi database is corrupted only occasionally due to process down and disk failure. Therefore back up NNMi settings and data periodically.