Resolving Volume Mounting Problems Because of Corrupted Directory Entry Tables or File Allocation Tables

To diagnose problems when mismatches exist in the duplicate copies of the file allocation table (FAT) and directory entry table (DET) on traditional volumes, identify whether the following conditions exist:

• A power failure has occurred and the server has not been shut down with the DOWN command.
• A hard disk has failed.
• A disk channel error has occurred.
• A volume does not dismount when you enter the DISMOUNT command.
• Directory information in cache is not completely written to disk.

To resolve problems when mismatches exist in the duplicate copies of the FAT and DET, do the following:

• Run VREPAIR.
• Add a UPS system so that the server is shut down automatically when a power failure occurs.
• Replace faulty disks or controllers.