When media are returned from the off-site vault during a typical volume rotation, they are expired and ready for reuse. To avoid confusion, it may be helpful to clear the media description information when an expired volume is returned to the robot.
You can configure NetBackup so that the media description field is cleared when media are returned to the robot. To do so, use the nbemmcmd to set the VAULT_CLEAR_MEDIA_DESC parameter. The media description field clears when other Vault information clears from the Media Manager volume database.