How much will the workloads allocate in my disk pool?

In the planning stage of a DPM installation you may want to calculate the amount of disk space your workloads will use. DPM will create two different volumes in the DPM disk pool, the replica- and recovery point volume.

You calculate your replica volume with the following formulas:

For Exchange data = Data source size x (1 + log change) / (alert threshold - .05)
For SQL Server data = Data source size x (1 + log change) / (alert threshold - .05)
For Windows SharePoint Services data = Total size of all databases/ (alert threshold - .05)
For Virtual Server data = Data source size x 1.5
For Windows Server system state = (Data source size x 3) / 2
For file data = (Data source size x 3) / 2

You calculate your Recovery point volume with the following formulas:

For Exchange data = 4.0 x retention range in days x log change x data source size + 1600 MB
For SQL Server data = 2.5 x retention range in days x log change x data source size + 1600 MB
For Windows SharePoint Services data = 1.5 x retention range in days x log change x total size of all databases + 1600 MB
For Virtual Server data = (Data source size x retention range in days x 0.02) + 1600 MB
For system state = (Data source size x retention range in days x 2) / 100 + 1600 MB
For files = (Data source size x retention range in days x 2) / 100 + 1600 MB

The log change is:

• 6% for Exchange
• 6% for SQL
• 10% for SharePoint