Wait!
ReFS - Data Deduplication is supported starting with Windows Server 2019.
From: https://docs.microsoft.com/en-us/windows-server/storage/data-deduplication/interop
D E
More info why is D) D and E only
You can't include C (Boot drive)
https://docs.microsoft.com/en-us/previous-versions/windows/desktop/dedup/about-data-deduplication
Deduplication is not supported on:
System or boot volumes
Remote mapped or remote mounted drives
Cluster shared volume file system (CSVFS) for non-VDI workloads or any workloads on Windows Server 2012
Files approaching or larger than 1 TB in size.
Volumes approaching or larger than 64 TB in size.
Got this question on 7/31/23. Didn't have the option to choose D and E only. I even left feedback that ReFS now supports Data Deduplication at the end of the exam. So, I just chose D only.
Drive C is OS system drive & the format of Drive F is not support. So that only drive D & E is available to support Data Deduplication. Is it concept right?
Answer D. ''Data Deduplication is fully supported on Storage Spaces Direct with ReFS or NTFS-formatted volumes (mirror or parity). ReFS-formatted volumes are supported starting with Windows Server 2019. Deduplication is not supported on volumes with multiple tiers.''
Tricky question:
Introduction blog post stands that OS is not supported: https://techcommunity.microsoft.com/t5/storage-at-microsoft/introduction-to-data-deduplication-in-windows-server-2012/ba-p/424257
Documentation for 2012 R2 stands that is not supported: https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/hh831700(v=ws.11)?redirectedfrom=MSDN#BKMK_Step1
New documentation "Data Deduplication interoperability" doesn't mention anything about the OS drive: https://learn.microsoft.com/en-us/windows-server/storage/data-deduplication/interop
ChatGPT says that it is possible but not recommended.
D and E
https://learn.microsoft.com/en-us/windows-server/storage/data-deduplication/interop
Data Deduplication is fully supported on Storage Spaces Direct with ReFS or NTFS-formatted volumes
https://learn.microsoft.com/en-us/previous-versions/windows/desktop/dedup/about-data-deduplication
Deduplication is not supported on:
System or boot volumes
D is the answer
https://docs.microsoft.com/en-us/windows-server/storage/refs/refs-overview
Functionality
The following features are available with ReFS and NTFS:
Feature ReFS NTFS
BitLocker encryption Yes Yes
Data Deduplication Yes1 Yes
note 1 Available on Windows Server, version 1709 and later, Windows Server 2019 (1809) LTSC or later.
Data deduplication is not supported on boot or system drives:
Deduplication was built for NTFS data volumes and it does not support boot or system drives
Agree!
https://docs.microsoft.com/en-us/windows-server/storage/data-deduplication/understand
File system The file system is the software and on-disk data structure that the operating system uses to store files on storage media. Data Deduplication is supported on NTFS formatted volumes.
C is boot vol. You cannot dedupe the boot vol. Common guys. Ez question.
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