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Data Dedup on ReFS MBS volume supported? RRS feed

  • Question

  • Hi All. Does anyone know if enabling dedup on a Modern Backup Storage ReFS volume that's on server 2019/DPM 2019 is supported? If so, has anyone does this successfully? DPM is running on a physical server with JBOD disks as the MBS volume. Thanks in advance.
    Tuesday, December 17, 2019 1:04 AM

Answers

  • Hi,

    DPM 2019 running on Windows 2019 does not support enabling ReFs dedup for the volumes used for modern backup storage.  Yes, it can be enabled and is supported by Windows 2019, however internal testing has revealed it severely affects backup performance so we are not supporting that at this time.

    However, Leon is correct that if you virtualize the DPM Server and host the .vhdx files that make up disks used for the MBS volume(s) on another volume that has dedup enabled, DPM does support that.   However, we have also seen performance issues with that configuration and is not recommended for large DPM Servers.

    Regards
    Mike Jacquet

      


    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, December 17, 2019 5:27 PM
    Moderator

All replies

  • Hi,

    Data deduplication is both supported and can be used on DPM that uses Modern Backup Storage (MBS), you can actually save a large amount of data this way.

    You can find more information from the Microsoft official documentation over here:

    Deduplicate DPM storage

    Here’s also a good blog post about it:

    How to reduce DPM 2016 storage consumption by enabling deduplication on Modern Backup Storage?

    Best regards,
    Leon

    Blog: https://thesystemcenterblog.com LinkedIn:

    Tuesday, December 17, 2019 4:44 AM
  • Hi,

    DPM 2019 running on Windows 2019 does not support enabling ReFs dedup for the volumes used for modern backup storage.  Yes, it can be enabled and is supported by Windows 2019, however internal testing has revealed it severely affects backup performance so we are not supporting that at this time.

    However, Leon is correct that if you virtualize the DPM Server and host the .vhdx files that make up disks used for the MBS volume(s) on another volume that has dedup enabled, DPM does support that.   However, we have also seen performance issues with that configuration and is not recommended for large DPM Servers.

    Regards
    Mike Jacquet

      


    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, December 17, 2019 5:27 PM
    Moderator
  • Thanks guys for all the answers. Mike, can I just ask is it only because of performance issues it's not supported? There's no issue with fragmentation or loss of data as well?

    Tuesday, December 17, 2019 11:01 PM
  • Hi,

    MBS volumes get highly fragmented due to the ReFs cloning used for recovery points - over time this leads to performance issue on it's own.  We're recommending that you use Windows storage spaces and configure tiered storage with SSD being ~5% or more of the pool capacity.  If you do that it may help.   I'm not aware of any data loss resulting from enabling ReFs Dedup for MBS volumes. 

    Regards
    Mike Jacquet


    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, December 17, 2019 11:56 PM
    Moderator