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.

  • Data Verification Options

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

    • Verification of Deduplication Database

      Verifies only the unique data blocks and completes an integrity check on the disk against the data on the DDB.

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

      When to use:

      • Use this option to identify only unreadable or inaccessible data blocks so that new backups refer only to valid data blocks.
      • This option does not ensure that the existing backup jobs are restorable.
    • Quick Verification of 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.

      When to use:

      • 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.
    • Verification of Existing Jobs on Disk and Deduplication Database

      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.

      The 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.

      When to use:

      • 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.
    • Reclaim idle space on Mount Paths with no drill hole capability*

      *Contact Customer Support to enable this feature.

      Use this option for disk mount paths that do not support sparse files.

      Running a data verification job on the ddb with this option enabled defragments the data files that are identified (during the quick verification phase) with the unused space. The valid data blocks are retained. The invalid data blocks that are not being referred to by any backup jobs are deleted thereby reclaiming the unused storage space.

      • Reclamation Level

        Use this slider to select the level of reclamation to be done. On the slider the numbers indicate the percentage of unused data blocks that can be defragmented.

        1 is equal to 80%

        2 is equal to 60%

        3 is equal to 40%

        4 is equal to 20%

        For example: By default the slider is set at 3. This indicates that the data files that have 40% or more of invalid data blocks (unused space) and 60% or less of valid data blocks will be selected for defragmentation to reclaim the unused space.

        However, if you set the slider to 4, then the data files that have 20% or more of invalid data blocks (unused space) and 80% or less of valid data blocks will be selected for defragmentation. This will result in a very high I/O on the disk for reclaiming only 20% or more of the unused space.

  • 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

    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.

Advanced Data Verification Options - Media

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

All Picked Jobs

If selected, all jobs residing on the storage policy copy (s) selected from the Data Verification dialog box will be verified.

Only Following Media

Allows you to select only those backups residing on specified media to be verified during the data verification operation.

  • Available Media

    Lists the media available for the selected storage policy copies.

  • Selected Media

    Lists the media selected for this data verification operation.