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DPM and Memory

Updated: April 21, 2010

Applies To: System Center Data Protection Manager 2010

When the memory in use by all the existing processes exceeds the amount of RAM available, the operating system will move pages (4 KB pieces) of one or more virtual address spaces to the computer’s hard disk, freeing that RAM for other uses. In Microsoft Windows systems, these pages are stored in one or more files, called pagefile.sys, in the root of a partition.

DPM requires a pagefile size that is 0.2 percent the size of all recovery point volumes combined, in addition to the recommended size (generally, 1.5 times the amount of RAM on the computer). For example, if the recovery point volumes on a DPM server total 3 TB, you should increase the pagefile size by 6 GB.

For more information about modifying the pagefile size, see Change the size of the virtual memory paging file (http://go.microsoft.com/fwlink/?LinkId=95116).

There is a Volume Shadow Copy Service (VSS) non-paged pool limitation on 32-bit operating systems. Therefore, if you are protecting more than 10 TB of data, the DPM server must be running on a 64-bit operating system.

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