The effect of virtual machine discovery on vCenter
In all but the largest environments, it may be advantageous to set the option so that discovery occurs more often.
If changes occur to virtual machine configuration (such as adding, deleting, or moving vmdk files), it may be necessary to set to 0. With a setting of 0, NetBackup rediscovers the virtual machines and their configuration each time the policy runs.
Note:
If the vmdk files are reconfigured and the next backup runs without rediscovery, NetBackup is not aware of the vmdk changes. It attempts to back up the virtual machines in their previous configuration. The result may be an incorrect backup.