A Disk storage unit is configured with the following default values:
Maximum concurrent jobs = 1. The maximum number of backups that NetBackup can send to the disk concurrently. For example, if NetBackup assigns three backup jobs to the storage unit, the first job starts and the other two jobs must wait.
Maximum fragment size = 2000. The maximum fragment size specifies (in megabytes) the largest fragment that NetBackup can use for backup images. This setting is normally used to ensure that the backup does not exceed the maximum size that the file system allows. The maximum size depends on the file system.