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General DPM Questions and Site-To-Site Replication RRS feed

  • Question

  • We are currently planning a new backup infrastructure using DPM and all D2D based technology. We are planning on backing up data with a 30 day retension period and then replicating that to a remote site. With a 30 day retension range, we would need to backup approximately 26 TB worth of data. Numbers for these estimates were gathered using the formulas from this site: http://technet.microsoft.com/fr-fr/library/ff399599.aspx

    Questions: 

    1. From the link above, they talk about "Log Change" and "Alert Threshold". What aexactly are they refereing to here?
    2. Will DPM be able to manage 26 TB worth of data?
    3. If we use multiple direct attached storage arrays, will DPM be able to utilize more than one disk?
    4. For site-to-site replication, does DPM create an exact clone of the data in the primary site or are you just backing up the database?

    Thanks for any help.

    Chris

    Tuesday, March 22, 2011 4:47 PM

Answers

All replies

  • Hi,

    1. - Change log is only applicable to workloads that consist of databases, like exchange . sql, sharepoint.  Knowing how many / size the logs are is needed to accuratly calculate storage needs.  Use the default for Alert threshold -.05 or basically .85.  We have additional storage calculators here: http://blogs.technet.com/b/dpm/archive/2010/09/02/new-dpm2010-storage-calculator-links-sep-2010.aspx

    2. Yes, we support up to 80TB in the storage pool, up to 40TB for recovery point volumes.  See http://technet.microsoft.com/en-us/library/ff399280.aspx

    3. Yes once the disks are added to the storage pool, DPM will use them as needed automatically.

    4. DPM protects one or more data sources under primary protection much the same was we perform file protection - we keep track of block level changes and apply the to the secondary servers replica. 


    Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.
    Tuesday, March 22, 2011 5:58 PM
    Moderator
  • All good news.

    Lastly, for question 4, if the primary site went down, we could recover 100% from the secondary site if needed. Does the secondary get the block level changes from the primary DPM database or does it actually read the disk on the primary for the changes?

    Thanks again.

    Tuesday, March 22, 2011 6:42 PM
  • Yes,  you can switch protection and the secondary DPM server will act just like the Primary did, it will continue making new RP's and you can restore back to original Protected Servers.  The data on the Secondary DPM Server will be current up to the point of that last successful sync with the primary before it went down.  To restore data from that last successful synch - you just choose to make a new recovery point without synchronizating, then that RP will show up under the recovery tab.   DPM database does not contain protected data, DPM storage pool holds all protected data, so all xfers between P and S are done from the storage pool.
    Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.
    Wednesday, March 23, 2011 11:13 PM
    Moderator
  • Thank you Mike. This information was extremely useful.
    Thursday, March 24, 2011 3:37 PM