HP D2D Manual page 37

NOTE: A typical D2D based Disk Library configuration will have only one mount path, i.e. the
share used to create it in the first place. Therefore, this setting is only relevant if multiple network
share paths are created during the setup of the Disk Library.
Fill and spill mount paths: This specifies that the system should completely consume (fill) the
free space in a mount path before utilizing another mount path.
Spill and fill mount paths: This specifies that the system should round-robin (spill) between the
available mount paths for each job.
For HP D2D NAS shares the preferred setting is "Fill and Spill" because we do not want unmanaged
jobs switching between multiple D2D NAS shares which may cause the number of open file limits
to be exceeded.
Multiple Media Agents and secondary mount paths 37