Data Verification of Deduplicated Data

Note

For online help of Run space reclamation dialog box, see Space Reclamation - Online Help.

Use this dialog box to select the criteria for a data verification operation.

Note

During the first phase of data verification operation, data pruning is disabled. However, if a data verification job and a data aging job run at the same time, then the data verification job might complete with chunk errors.

To avoid this problem, schedule data aging operations and data verification operations to run at different times. For example, the data aging job is by default scheduled to run every day at 12:00 pm. You can schedule the data verification operations to run at 5:00 AM every day.

Select Source MediaAgent

Allows you to select the source MediaAgent from which you will run the data verification job.

The MediaAgent should be one of the MediaAgents displayed in the Data Paths tab of the Copy Properties dialog box.

When the <Any MediaAgent> is selected, the system automatically picks up the appropriate MediaAgent, especially when multiple MediaAgents are associated with the copy. This ensures faster reads from the copy.
Run Incremental Verification

For full data verification job, clear the check box.

For incremental data verification job, select thecheck box.

Default: Selected.

Note

Incremental DDB data verification runs only if the DDB and the data mover MediaAgents are in v11. The DDB store version can be in v9.0, v10.0 or v11.0.
Data Verification Options

Note

The Data Verification Options section will appear when you run data verification job from Deduplication Engine level.

Options	Description	When to use	Applies To
Quick verification of existing jobs on disk and deduplication database	Verifies the existence of unique data blocks and whether they are consistent with the data blocks metadata available on the disk. For example, if the DDB has 1 to 10 unique data blocks that are located on disk location X, the process verifies whether these data blocks are available in that location. That is, if the DDB states that the unique data blocks 1 to 10 are valid and available in X volume (for example: x:\CV_MAGNETIC\v_##) and the metadata on the disk states that those data blocks are invalid, then those data blocks are marked as invalid. During subsequent backups, new data is written for those invalid data blocks. The job also identifies all the files that can be defragmented and logs the details in the DDBMntPathInfo.log in the data mover MediaAgents.	Use this option for a quick verification by checking the presence of the data blocks on the disk so that the new backup jobs refer only to the valid data blocks. In comparison with the Complete Verification of Existing Jobs on Disk and Deduplication Database and Verification of Deduplication Database options, this option is faster because it does not read the data blocks on the disk. Instead, it ensures that both the DDB and disk are in sync.	Full and Incremental Data Verification Job
Verification of existing jobs on disk and deduplication database	The Validate dedup data phase, verifies all the deduplicated jobs (unique data blocks and all references to the blocks) on the disk with the DDB and on the CommServe database. Data verification process is faster because all the unique blocks are first identified and validated. The unique data blocks that are referred by multiple deduplicated backup jobs are read and verified only once in the verify phase. Notes: The Job Details dialog box displays the Estimated Completion time per phase when you run a DDB verification with Verification of Existing Jobs on Disk and Deduplication Database option. The Job Details dialog box displays the Percent Complete per phase when you run a DDB verification with Verification of Existing Jobs on Disk and Deduplication Database option. Both the phases are 50% each.	Use this option for a complete verification of data blocks as well as existing backups on the disk. This option ensures that existing backup jobs are restorable and can be copied during Auxiliary Copy operations.	Full and Incremental Data Verification Job

Options

Description

When to use

Applies To

Quick verification of existing jobs on disk and deduplication database

Verifies the existence of unique data blocks and whether they are consistent with the data blocks metadata available on the disk.

For example, if the DDB has 1 to 10 unique data blocks that are located on disk location X, the process verifies whether these data blocks are available in that location.

That is, if the DDB states that the unique data blocks 1 to 10 are valid and available in X volume (for example: x:\CV_MAGNETIC\v_##) and the metadata on the disk states that those data blocks are invalid, then those data blocks are marked as invalid. During subsequent backups, new data is written for those invalid data blocks.

The job also identifies all the files that can be defragmented and logs the details in the DDBMntPathInfo.log in the data mover MediaAgents.

Use this option for a quick verification by checking the presence of the data blocks on the disk so that the new backup jobs refer only to the valid data blocks.

In comparison with the Complete Verification of Existing Jobs on Disk and Deduplication Database and Verification of Deduplication Database options, this option is faster because it does not read the data blocks on the disk. Instead, it ensures that both the DDB and disk are in sync.

Full and Incremental Data Verification Job

Verification of existing jobs on disk and deduplication database

The Validate dedup data phase, verifies all the deduplicated jobs (unique data blocks and all references to the blocks) on the disk with the DDB and on the CommServe database.

Data verification process is faster because all the unique blocks are first identified and validated. The unique data blocks that are referred by multiple deduplicated backup jobs are read and verified only once in the verify phase.

Notes:

The Job Details dialog box displays the Estimated Completion time per phase when you run a DDB verification with Verification of Existing Jobs on Disk and Deduplication Database option.
The Job Details dialog box displays the Percent Complete per phase when you run a DDB verification with Verification of Existing Jobs on Disk and Deduplication Database option. Both the phases are 50% each.

Use this option for a complete verification of data blocks as well as existing backups on the disk.

This option ensures that existing backup jobs are restorable and can be copied during Auxiliary Copy operations.

Full and Incremental Data Verification Job

No of Streams to be used in Parallel
- Number of Streams
  
  Allows you to select the number of data streams whose backups are verified at the same time during the data verification operation.
- Allow Maximum
  
  If selected, the maximum number of data streams will be verified at the same time during the data verification operation.
Use Scalable Resource Allocation

To enhance the scalability of the space reclamation operation and to optimize the processes of scaling the resources, select this option. For more information, see Scalable Resource Allocation.

This option is enabled by default.