During a backup, the following events occur in this order:

• From the Enterprise Media Manager (EMM), NetBackup obtains a media ID for the tape that is used for the backup. It then sends a tape-mount request to ltid.

• ltid on the NetBackup for NDMP server sends the necessary NDMP (SCSI robotic) commands to mount the requested tape on the storage device.

• NetBackup sends the NDMP commands that are necessary to have the NDMP server application perform a backup to the tape. The backup data travels in one of two ways:

  • Between the local disk and tape drives on an NDMP host.

  • Over the network, data travels from an NDMP host without its own storage device to an NDMP host (or NetBackup media server) with a locally attached storage device (three-way back up).

• The NDMP server application sends information to the NetBackup for NDMP server about the files that were backed up. This information is stored in the NetBackup file database.

• The NDMP server application sends status about the backup operation to the NetBackup for NDMP server.