Data Verification Online Help

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

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.
Copy Selection
- All Copies
  
  If selected, backups from all storage policy copies will be verified during this data verification operation.
- Select a Copy
  
  Allows you to select a copy in which all backups on this copy will be verified during this data verification operation.
Run Incremental Verification

Use this option to verify the deduplicated data blocks that are newly added or data blocks that are not verified during the last data verification job.

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. 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 Quick verification of existing jobs on disk and deduplication database option. Both the phases are 50% each.	Use this option for a quick verification of all the deduplicated jobs (unique data blocks and all references to the blocks) on the disk with the DDB and on the CommServe database. This option validates if the existing backup jobs are valid for restores and can be copied during Auxiliary Copy operations. In comparison with the Verification of existing jobs on disk and deduplication database option, 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 if you want to verify all existing backups and to ensure that the new backups refer only to valid data blocks. 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.

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 Quick verification of existing jobs on disk and deduplication database option. Both the phases are 50% each.

Use this option for a quick verification of all the deduplicated jobs (unique data blocks and all references to the blocks) on the disk with the DDB and on the CommServe database.

This option validates if the existing backup jobs are valid for restores and can be copied during Auxiliary Copy operations.

In comparison with the Verification of existing jobs on disk and deduplication database option, 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 if you want to verify all existing backups and to ensure that the new backups refer only to valid data blocks.

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.
Jobs to Verify

Note

The Jobs to Verify options will appear when you run data verification job from Storage Policy level.
- Newly available
  
  If selected, only newly available jobs will be verified during the data verification operation.
- Verification has expired
  
  If selected, only jobs for which the verification has expired will be verified during the data verification operation.
- Both Newly available and Verification expired
  
  If selected, both newly available jobs and jobs for which the verification has expired will be verified during the data verification operation.
Description

Use this field to enter a description about the entity. This description can include information about the entity's content, cautionary notes, etc.
Advanced

Provides access to the Advanced Data Verification Options dialog box, which allows you to verify backups for only selected media.