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DPM 2010 and storage pool allocation, how much free space needed? RRS feed

  • Question

  • Hello Everyone,

    I'm currently running a DPM 2010 server.

    Is there a minimum unallocated space that should be left on DPM Storage pool disk in order to have a optimized disk usage for backups?

    Currently, I've got a total storage pool capacity (with 6 disk) of 27756,41 GB with:

    • 27595,02 GB Used space
    • 161,39 GB unallocated space

    So that makes less than 1% of free space left

    Does this situation can be annoying for the DPM server? Are there any recommendation on that point?

    Regards,

    Evan

    Wednesday, August 6, 2014 1:37 PM

Answers

  • Hi,

    There is no minimum free (unallocated) space requirement in the DPM storage pool.  DPM allocates space 'as needed" and as long as the storage pool has some available - then all is good.  The day may come where you add a new data source and the amount for available free disk space is inadequate and that will prevent you from adding it, or more likely, DPM needs more space for replica or recovery point volume expansion and can't due to lack of free disk space.

    One of the most challenging workloads to get right from a disk utilization perspective is Exchange due to the large amounts of logs that can get generated when migrating users mailboxes.  If you know that will be taking place, then to help mitigate the explosion of disk requirements you can take more frequent express full backups and reduce retention range until the migration is complete.


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.

    Tuesday, August 12, 2014 3:36 PM
    Moderator

All replies

  • Hi

    Are your backups set to autogrow on the protection group?

    Friday, August 8, 2014 7:47 AM
  • Hi,

    There is no minimum free (unallocated) space requirement in the DPM storage pool.  DPM allocates space 'as needed" and as long as the storage pool has some available - then all is good.  The day may come where you add a new data source and the amount for available free disk space is inadequate and that will prevent you from adding it, or more likely, DPM needs more space for replica or recovery point volume expansion and can't due to lack of free disk space.

    One of the most challenging workloads to get right from a disk utilization perspective is Exchange due to the large amounts of logs that can get generated when migrating users mailboxes.  If you know that will be taking place, then to help mitigate the explosion of disk requirements you can take more frequent express full backups and reduce retention range until the migration is complete.


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.

    Tuesday, August 12, 2014 3:36 PM
    Moderator