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Block-Level Restores

You can perform a file-level or a volume-level restore from a block-level backup.

High-Level Process for Block-Level Restores

  1. If you are performing a volume-level browse and restore, the entire volume is restored.
  2. If you are performing a file-level browse and restore, the following operations occur:
    • Depending on whether the metadata collection was enabled during backup, one of the following browse methods is selected if you perform a browse operation:
      • If metadata collection was enabled, a browse from the index is initiated.
      • If metadata collection was disabled, a live browse is initiated.
    • The selected files and folders are restored.

Live Browse

Applies to: Microsoft Windows 2008 R2 or later.

Live browse initiates a pseudo-mount which constructs a device to store the blocks. The size of the staging folder can be as large as the restore data. If the size of the staging folder is smaller than the restore data, then the extents are pruned based on the LRU (Least Recently Used) algorithm, for the new extent restores. This might result in decreased performance during the restore operation.

By default, the staging folder is in the job results directory. You can configure a different path to the staging folder using the following steps:

  1. On your client, add the sPseudoMountStagingFolder additional setting with the path to the new staging folder.

    For instructions on adding the additional setting from the CommCell Console, see Add or Modify an Additional Setting.

    Refer to the following table for applicable values:

    Property Value
    Name sPseudoMountStagingFolder
    Category MediaAgent
    Type String
    Value Path to the new staging folder
  2. Restart Commvault services on the client computer. For more information, refer to Services - Advanced.

Note: If you have an antivirus software installed on your computer, make sure that you add the NetApp vendor disks to the antivirus exclusion list.

Remote Browse

In the Browse and Restore dialog box, Advanced Options tab, the client computer is selected in the Use proxy box, by default. However, if a different MediaAgent that is not compatible with the operating system is chosen, then the browse operation might fail.

For example, if the Windows client computer is backed up to a Linux MediaAgent and the Windows client computer is chosen as proxy MediaAgent, then you can browse the files.

Multi-Stream Restores

Applies to: File System Agent

Block-level restores use a single stream by default. You can configure the restore operation to use multiple streams.

In addition, you can define alternate data paths to improve restore performance. For more information, see GridStor® (Alternate Data Paths) - Overview.

You can perform a browse and restore operation at the backup set and subclient levels.

Notes:

  • Multi-stream restores are not supported by Laptop Backup clients.
  • Multi-stream restores do not support restores of system state backups.

Pruning Blocks to Reclaim Space

The restored blocks are saved in the device files under the job results folder. To reclaim space in the job results directory, the restored blocks are pruned using the LRU (Least Recently Used) algorithm.

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