DPM 2007 -- Calculating Disk Allocation - The Official System Center Data Protection Manager Team Blog - Site Home - TechNet Blogs

DPM 2007 -- Calculating Disk Allocation

DPM 2007 -- Calculating Disk Allocation

  • Comments 2
  • Likes

When you create a new Protection Group using the “Create Protection Group” wizard, DPM internally computes and allocates volumes for storing the replica and the shadow copies. This blog post enumerates the various formulae that we use internally to generate the default size.

 

File system datasource

SC size = (dataSourceSize * recoveryRangeInDays * 2) / 100 + 1 GB;

Replica size = (dataSourceSize * 3) / 2;

 

SQL DB

Replica size = dataSourceSize * (1 + LogChange) / (AlertThreshold - .05);

SC size = 2.5 * recoveryRangeInDays * LogChange * dataSourceSize + 1 GB

 

Exchange SG

replicasize = dataSourceSize * (1 + LogChange) / (AlertThreshold - .05);

SCSize = 4.0 * recoveryRangeInDays * LogChange * dataSourceSize + 1GB

 

where

Log change = 0.06

Alertthreshold = 0.9

 

- Mukul Singh Shekawat

Your comment has been posted.   Close
Thank you, your comment requires moderation so it may take a while to appear.   Close
Leave a Comment
  • dataSourceSize is that in MB or GB, or even bytes?

  • Keif,

    Since we haven't seen anything to cover File, SQL, etc. like the Exchange Spreadsheet, I had to create one of my own... dataSourceSize is in GB. As an Example,

    Data Size = 9.15 GB (or 9150 MB), Recovery Range = 5

    Replica=(9.15*3)/2=13.73 GB

    Recov. Points=(9.15*5*2)/100+1=1.92 GB

    This Seems to work for me, but hopefully we will be able to get our hands on a Excel SpreadSheet that inclused File, SQL, SharePoint, Etc. along with Exchange.