Accidentally enabled deduplication on DPM volume, what to do?

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ingo-d asked Apr 22, '21 ingo-d action Apr 22, '21

Accidentally enabled deduplication on DPM volume, what to do?

We have a productive instance of DPM 2019 running on Windows Server 2019 using a mapped iSCSI volume as backup storage. This volume is formatted with ReFS.
Recently an admin enabled deduplication on this volume with good intentions but without the knowledge that it is not supported by DPM. We disabled deduplication on the volume the next day.

My questions are: What is the immediate impact of this on the reliability of the backup and what is the best way to recover from it?

My plan would be to use the "Move disk storage" function to move each PG member to a new, non-deduplicated iSCSI volume. Will that ensure that backups will function reliably in future?

Grateful for any advice!
Ingo D.

windows-server-backup

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jiayaozhu-MSFT · Apr 27, 2021 at 02:01 AM

Hi,

I would like to check if the reply could be of help? If yes, please help accept answer, so that others meet a similar issue can find useful information quickly. If you have any other concerns or questions, please feel free to feedback.

Best Regards,
Joan

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Answer 1 · 2021-04-23T07:12:40.943Z

jiayaozhu-MSFT answered Apr 23, '21

Hi,

Thank you for your posting！

For your first question, I found the two articles can be helpful for you. These two articles explain what will happen after you disabling deduplication (if I understand correctly, you have disabled deduplication right?) and the suggestions after you disable deduplication:

https://social.technet.microsoft.com/Forums/ie/en-US/d48f27cd-f932-43af-a854-3552b09c9252/best-practice-disable-or-remove-deduplication-on-a-volume?forum=winserverfiles

https://nickwhittome.com/2014/10/01/disabling-data-deduplication-on-windows-server-2012r2/

Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.

For your second question, I want to firstly check the goal that you exactly want to achieve. You mean you want to "recover" from it. If you have successfully disable deduplication, then you just keep your DPM volume working properly as what you did before accidentally enabling deduplication, so I can barely understand what you want to recover to. Which kind of status of your backup you want to achieve?

Thank you for your support!

Best regards
Joan

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