Configure the parallelism for centralized Exchange backups
You can configure the parallelism setting for a centralized backup of Exchange databases by setting the
clientParallelism parameter value in the
userlockbox.cfg file on the Exchange server host.
About this task
The default parallelism setting for a centralized Exchange backup is 16. You can override this default setting with the
clientParallelism parameter setting in the configuration file.
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 Exchange 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 Exchange 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
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 Exchange DAG.
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 an Exchange DAG. For example:
clientParallelism=10
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