If you recover the NetBackup catalog from disk storage, you may have to run a NetBackup catalog synchronization command before you recover the catalog. The synchronization maps the disk media IDs from the backup environment to the disk media IDs in the recovery environment.

Manual catalog synchronization is required if the following are true:

- The catalog backup resides on one of the following storage types:

• An AdvancedDisk disk pool
• A Media Server Deduplication Pool (MSDP)
• An OpenStorage device

- The disk media IDs in the recovery environment differ from the disk media IDs in the backup environment. The disk media IDs may differ in the following uses cases:

• The storage devices are the same but the NetBackup master server installation is new. A master server host or disk failure may require that you install NetBackup. Configuring the devices in NetBackup may assign different disk media IDs to the disk volumes than were assigned originally.
• The disk storage devices are different than those to which the catalog backups were written. It may be in the same environment after storage hardware failure or replacement. It may be at another site to which you replicate the catalog backups and the client backups. Regardless, the catalog backups and the client backups reside on different hardware. Therefore, the disk media IDs may be different.

Rather than try to determine the disk media IDs, Symantec recommends that you synchronize the catalog manually in these recovery scenarios.

For manual synchronization, the NetBackup nbcatsync command is required.

The catalog recovery procedures include the optional steps for catalog synchronization