Accidentally enabled deduplication on DPM volume, what to do?

Ingo_D 1 Reputation point
2021-04-22T10:41:41.717+00:00

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
Windows Server Backup
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Backup: A duplicate copy of a program, a disk, or data, made either for archiving purposes or for safeguarding valuable files from loss should the active copy be damaged or destroyed.
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  1. JiayaoZhu 3,911 Reputation points
    2021-04-23T07:12:40.943+00:00

    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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