How to limit parallel disk processing in Veeam Agent for Microsoft Windows

KB ID: 3157
Product: Veeam Agent for Microsoft Windows
Veeam Backup & Replication
Version: 4.x
Published: 2020-04-27
Last Modified: 2020-08-13
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Challenge

Veeam Agent for Microsoft Windows version 4.0 offers the parallel disk processing feature. Parallel disk processing allows to transfer data from several disks to the target location simultaneously. By default, parallel disk processing is limited by the number of concurrent tasks that are available on the backup repository. To disable parallel processing or decrease the limit, use registry keys described below.

Solution

Create the following registry keys on the machine where Veeam Agent for Microsoft Windows is installed:

To disable parallel disk processing:
Key: HKLM\SOFTWARE\Veeam\Veeam Endpoint Backup
Type: DWORD
Name: EnableParallelDiskProcessing
Value: 0
Simply remove the key or change the value to 1 to re-enable parallel processing.

To change the parallel disk processing limit:
Key: HKLM\SOFTWARE\Veeam\Veeam Endpoint Backup
Type: DWORD
Name: ParallelProcessingMaxConcurrentDisks
Value: N
where "N" is the allowed number of concurrent tasks. For example, to allow simultaneous processing of 2 disks, change the value to 2.

More information

Note that parallel disk processing is also limited by the number of available concurrent tasks on the Veeam Backup & Replication side. To learn more, see the Limitation of Concurrent Tasks section of the Veeam Backup & Replication User Guide.
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