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PowerProtect Data Manager 19.11 Microsoft Exchange Server User Guide

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Configure the parallelism for centralized Microsoft Exchange Server backups

You can configure the parallelism setting for a centralized backup of Microsoft Exchange Server databases by setting the clientParallelism parameter value in the userlockbox.cfg file on the Microsoft Exchange Server host.

About this task

The default parallelism setting for a centralized Microsoft Exchange Server backup is 16. You can override this default setting with the clientParallelism parameter setting in the configuration file.

NOTE For a self-service Microsoft Exchange Server backup, you can specify the parallelism with the -Parallelism parameter setting in the Backup-Exchange PowerShell cmdlet, described in Back up Microsoft Exchange Server with the Windows PowerShell backup cmdlet.

Based on the number of CPUs on the host and the parallelism setting, the application agent uses the following effective parallelism value for a centralized Microsoft Exchange Server backup:

  • With 10 or more CPUs, the effective parallelism equals the minimum of the number of CPUs and the parallelism setting, minus 4. For example, with 12 CPUs and a parallelism of 16, the effective parallelism value is 8 (12 minus 4).
  • With 4 to 9 CPUs, the effective parallelism equals the minimum of the number of CPUs and the parallelism setting, minus 2. For example, with 8 CPUs and a parallelism of 10, the effective parallelism value is 6 (8 minus 2).
  • With fewer than 4 CPUs, the effective parallelism equals the number of CPUs. For example, with 2 CPUs, the effective parallelism value is 2.

If the effective parallelism value is 8, then 8 threads are created for the Microsoft Exchange Server backup, with each thread assigned to transfer either an EDB file or the related log files. An asset transfer is complete only when an EDB file and the related log files are both copied to the DD system. Using 8 threads, effectively 4 assets are backed up in parallel from the host.

You can set the clientParallelism parameter in the configuration file according to the following steps.

Steps

  1. Ensure that the file named userlockbox.cfg is located in the required directory:
    • When the Microsoft application agent is installed in the default directory, the userlockbox.cfg file must be located in the C:\Program Files\DPSAPPS\common\lockbox directory.
    • When the Microsoft application agent is installed in a non-default directory, the userlockbox.cfg file must be located in the <installation_directory>\common\lockbox directory.
    • The userlockbox.cfg file must exist on each node in an Microsoft Exchange Server DAG.
  2. In the userlockbox.cfg file, set the clientParallelism parameter to the required parallelism setting. Ensure that the parameter is set in the file on each node in a Microsoft Exchange Server DAG. For example: 
    clientParallelism=10

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