Media and device management process
When the media management and device management daemons are running, NetBackup or users can request data storage or retrieval. The scheduling services initially handle the request.
See Backup and archive processes.
The resulting request to mount a device is passed from nbjm to nbrb, which acquires the physical resources from nbemm (the Enterprise Media Manager service).
If the backup requires media in a robot, ltid sends a mount request to the robotic daemon that manages the drives in the robot that are configured on the local host. The robotic daemon then mounts the media, and sets a drive busy status in memory that is shared by itself and ltid. Drive busy status also appears in the Device Monitor.
See Figure: Media and device management example process.
Assuming that the media is physically in the robot, the media is mounted and the operation proceeds. If the media is not in the robot, nbrb creates a pending request, which appears as a pending request in the Device Monitor. An operator must insert the media in the robot and use the appropriate Device Monitor command to resubmit the request so the mount request occurs.
A mount request is issued if the media is for a nonrobotic (standalone) drive that does not contain the media that meets the criteria in the request. If the request is from NetBackup and the drive does contain appropriate media, then that media is automatically assigned and the operation proceeds.
For more information about NetBackup media selection for nonrobotic drives, see the NetBackup Administrator's Guide, Volume II.
Note:
When you mount a tape on UNIX, the drive_mount_notify script is called. This script is in the /usr/openv/volmgr/bin directory. Information on the script can be found within the script itself. A similar script is called for the unmount process (drive_unmount_notify, in the same directory).
When a robotic volume is added or removed through the media access port, the media management utility communicates with the appropriate robotic daemon to verify the volume location or barcode. The media management utility (through a library or command-line interface) also calls the robotic daemon for robot inventory operations.
Figure: Media and device management example process shows an example of the media and device management process.
