This option is enabled by default. In the great majority of cases, you should accept the default.

I/O on the virtual machine is quiesced before NetBackup creates the snapshot. Without quiescing file activity, data consistency in the snapshot cannot be guaranteed. If not consistent, the backed up data may be of little or no value.

If this option is disabled, the snapshot is created without quiescing I/O on the virtual machine. In this case, you must perform your own checks for data consistency in the backup data.

Caution: Symantec does not recommend that you disable quiesce. In most cases, this option should be enabled.