Set Read block size when backing up VMDK file

Symptom

In certain environment, the backup throughput of VMware VM gets affected by read block size when backing up VMDK file.

Solution

By default, the VMDK read block size is 2 MB. You can modify the size.

Follow these steps:

  1. Log into Agentless backup proxy.
  2. Run the command regedit to open registry editor.
  3. Navigate to the following registry key:

    4. HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine\AFBackupDll

  4. Create the registry values (DWORD) using the following name:

    5. ReadVirtualDiskBlockSizeKB

  5. Specify desired value as the read block size (unit is KB).