You can run full backup and log only backup operations from the FSBased backupset of the instance that has cluster settings are configured.
When you run a backup operation, the Commvault software connects to master server only to issue a check point, and the backup operation progresses in the standby server.
For more information, see Running a Full Backup from an FSBased Backup Set and Log Only Backups.
Note
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If you are using streaming replication, the log backups will run from the master server.
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For streaming replication, if archive_mode is set to on, the log backup will be performed on the master node. If archive_mode is set to always, the log backup will be performed on the standby node by default.
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For log shipping type, the log backup will be performed on the standby node by default.
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If Always use master for log backup is selected, it will perform log backup from the master node irrespective of the value set for archive_mode.
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It is recommended to set archive_mode to always to ensure backup of logs between the log only backup and failover.