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NetBackup functions well whether or not bar codes are used. However, Symantec suggests using media with bar codes in the robots that can read bar codes.
bar codes offer the following advantages:
When you add new media to a robot, NetBackup is able to assign media IDs according to specified criteria.
More accurate tracking of volume location
A robot inventory update can determine which volumes are in a robot.
Not using bar codes can adversely affect performance for some robots. A robot that reads bar codes performs a scan each time it moves a tape. The robot stores the correct bar code in memory or verifies a previously saved bar code. However, if a tape does not have a bar code, the robot retries the scan multiple times, degrading performance.