Synchronizing Data on the Disk and the Index for Block-Level Backup for UNIX

You can enable automatic synchronization of data on the source disk and the index to detect inconsistency between the extents on the volume snapshot and the extents backed up on the media.

Synchronization of data works by comparing the extent hashes from the source volume and the extent hashes currently available in the index, and the missing extents, if any, are backed up.

After you enable this feature, the subsequent block-level backup job (full or incremental) might run longer by 15%-30% because the backup job calculates, compares, and sends the extent hash to the index. Sometimes, these jobs might be CPU intensive.

Before You Begin

• You must have indexing enabled on your client computer.

• Starting Service Pack 12, this feature is selected by default for new subclients.

• This feature is not selected by default on clients upgraded to Service Pack 12 and later.

• This feature is not supported on clients running Service Pack 11 or earlier.

Procedure

1. From the CommCell Browser, expand Client Computers > client > File System > backup_set.

2. Right-click the subclient for which you want to enable data synchronization and click Properties.

   The Subclient Properties dialog box appears.

3. On the General tab, in the Subclient Name box, type a name for the subclient.

4. To set the content for the subclient, on the Content tab, click Browse to locate the content, and then click OK.

5. On the Storage Device tab, in the Storage Policy list, click a storage policy name to associate with the subclient.

   Tip: To create a new storage policy, click Create Storage Policy and follow the instructions in the storage policy creation wizard.

6. Click Advanced.

   The Advanced Properties dialog box appears.

7. In the Advanced Subclient Properties dialog box, click the Advanced Options tab.

8. On the Advanced Options tab, set up your block-level backup:

   1. To enable block-level backup, select the Optimized for File system with large number of small files(Block Level Backup) check box.

   2. Verify if the Reconcile Backup check box is selected.

   3. In the Every n days from the previous backup job box, enter the number of days after which any backup job will automatically synchronize the missing files.

      Note: By default, the synchronization runs after every incremental job that runs after a synthetic full backup.

9. Click OK.