Why does a Fullexpress Backup need to transfer changed sectors AGAIN ? RRS feed

  • Question

  • Hi !

    I am having a trouble understanding something about DPM.

    Apparently DPM copies changed data of the production servers to the DPM server every 15/30/etc. minutes defined in the synchronisation frequency value. So the latest changed sectors should be at the DPM server already. Why does DPM then need to copy changed sectors from the production server AGAIN during a full express backup ? According to technet during an express full backup DPM will copy all changed sectors since the last full express backup from the production servers and then merge it with the replica. This will lead to higher load on the production servers.

    The fact that DPM seems to copy changed sectores twice seems redundant to me. If you could change this behaviour, an express full backup would not need many ressources of the production server anymore, you would just need to make a last synchronisation and then merge the latest changed sectors since the last express full from the DPM server (!) to the replica.

    Thanks for your answer !


    Wednesday, February 2, 2011 6:40 AM


  • Hi Alex,

    Incremental backups (every 15/30 etc..) only bring over log files, not changed DB sectors.  Changed DB sectors are only brought over during express full backups.

    Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.
    Wednesday, February 2, 2011 7:00 PM