Switching off hole drilling on mount path [ ] as it is not supported

Article ID: DD0050 The mount path file system does not support micro pruning (that is, pruning of individual data blocks).

Symptom

The following error message is displayed in the SIDBPrune.log file, which is in the /Log Files folder.

### FinalizeSFile:1885 Switching off hole drilling on mount path [ ] as it is not supported

Cause

Some file systems do not support space reclamation of deleted data blocks (drilling holes) that are not at the end of the file. The lack of support for micro-pruning is usually related to the lack of support for sparse files.

When a unique block of data is eligible for deletion, the failed attempt to delete the data is recorded in the SIDBPrune.log file. The error continues until the unique block of data is deleted. If the block of data to prune is at the end of the file, then that file is truncated to remove the eligible data from the disk.

The following file systems support the drill hole operation:

  • NetApp 8.3.1 and more recent versions
  • EMC Unity
  • Dell FluidFS

Resolution

If the file system does not support sparse files, and you want to disable the drilling of holes deduplicated data is pruned, you can use the additional settings the are described below.

Regardless of these settings, the software tracks the data to be deleted and, if the block of data to prune is at the end of the file, then that file is truncated to remove eligible data from the disk.

You must configure these additional settings on the MediaAgent that hosts the deduplication database (DDB) and on all other MediaAgents that are used as data movers for the mount paths or the data paths that are involved.

Use the DedupDrillHoles additional settings:

  1. From the CommCell Browser, expand Storage Resources | MediaAgents.
  2. Right-click the appropriate MediaAgent, and then click Properties.
  3. In the MediaAgent Properties dialog box, click the Additional Settings tab, and then click Add.
  4. In the Add Additional Settings dialog box, in the Name box, type DedupDrillHoles.
    The CategoryType and Description details fill automatically.
  5. In the Value box, type 0.
  6. Click OK and then click OK to close the MediaAgent Properties dialog box.