This parameter applies only to the off-host backups that use the NetBackup Media Server or Third-Party Copy Device backup method.

With the default setting 1 (Yes), this parameter specifies that full-sized instant snapshots are not available for backup until the mirror synchronization is complete. Before synchronization is complete, some of the data that is required for the backup resides on the source disks but not on the snapshot disks. If the media server has access to the snapshot disks but does not have access to the source disks, and if the backup starts before the snapshot disks are fully synchronized with the source, the backup fails.

For a NetBackup Media Server or Third-Party Copy Device backup - if the media server cannot access the source disks - set this parameter to 1. If both the source and the snapshot disks are visible to the media server, you can set this parameter to 0 (No).