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BrianMurphy-4429 avatar image
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BrianMurphy-4429 asked NoelTengmyIAN-6342 answered

Is dedupe supported on Azure Stack HCI/S2D (Server 2019) for ReFS formatted mirror-accelerated parity volumes?

The documentation here "https://docs.microsoft.com/en-us/windows-server/storage/data-deduplication/interop" is not clear to me because the reference of an unsupported configuration of deduplication on volumes with multiple tiers is in a bullet point that references NTFS-formatted volumes

Blockquote

Data Deduplication is fully supported on Storage Spaces Direct NTFS-formatted volumes (mirror or parity). Deduplication is not supported on volumes with multiple tiers. See Data Deduplication on ReFS for more information.

Blockquote

However, according to this "https://techcommunity.microsoft.com/t5/windows-server-ama/refs-s2d-and-dedup-compression/m-p/100456" in Windows Server version 1709 deduplication introduced a feature known as near-inline optimization, which works (specifically) with ReFS mirror-accelerated parity. Unless this feature was deprecated before Windows server 2019, I would expect it to be supported on ReFS mirror-accelerated parity.

Mirror-accelerated parity is appealing as Cosmos points out here "https://techcommunity.microsoft.com/t5/storage-at-microsoft/here-s-what-you-missed-8211-five-big-announcements-for-storage/ba-p/428257".

windows-server-storageazure-stack-hci
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XiaoweiHe-MSFT avatar image
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XiaoweiHe-MSFT answered

Hi,

As far as I know, dedup is supported on Refs formatted mirror accelerated party volumes.

Mirror-accelerated parity is a Storage Spaces storage layout.

Deduplication will work on any ReFS volume on Server 2019.

Some related articles for your reference:

https://www.starwindsoftware.com/blog/why-you-should-consider-storage-spaces-direct-in-windows-server-2019

https://community.spiceworks.com/topic/2282945-is-storage-spaces-on-stand-alone-server-2019-for-smb-viable?page=1

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

Thanks for your time!
Best Regards,
Anne


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Jim-Gandy avatar image
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Jim-Gandy answered Jim-Gandy edited

Based on this information. Would it be possible to update the bullet point on https://docs.microsoft.com/en-us/windows-server/storage/data-deduplication/interop to clarify?

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PS> Also the Data Deduplication on ReFS link does not have anything about Windows Server just Win10.


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NoelTengmyIAN-6342 avatar image
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NoelTengmyIAN-6342 answered

Jim, I just saw this thread. I believe "unsupported configuration of deduplication on volumes with multiple tiers" refers to Azure Stack HCI using a combination of NVMe, SSD and HDD as the storage devices. In this design, SSD and HDD are the storage capacity while NVMe is the cache.

Can anyone confirm?

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