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Best Practices for Microsoft Data Deduplication

Best Practices for Microsoft Data Deduplication

KB ID:	2023
Product:	Veeam Backup & Replication
Version:	All
Published:	2015-04-22
Last Modified:	2024-11-22

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Purpose

This article documents Best Practices, Limitations, and Considerations relating to the use of storage that has Microsoft Windows Deduplication enabled when storing backup files created and managed by Veeam Backup & Replication.

Considerations and Recommendations

[CRITICAL] Veeam strongly recommends that all Microsoft Data Deduplication tasks be scheduled to operate when Veeam jobs are not operating, as Microsoft Data Deduplication tasks can and will interfere with Veeam backup file creation and manipulation operations.
Microsoft recommends that "Optimally, Data Deduplication should have 1 GB of memory for every 1 TB of logical data. For instance, if you are optimizing a 10 TB volume, you would optimally need 10 GB of memory allocated for Data Deduplication (1 GB * 10). This ratio will ensure the maximum performance for Data Deduplication jobs."
Data Deduplication on ReFS requires at least Server 2019.
Veeam recommends that the MinimumFileSize value be set to prevent Microsoft Data Deduplication from causing file locks on smaller metadata (vbm,vacm,vasm) files associated with restore point creation.

PowerShell example command:
^{Adjust volume letter as needed.}

# This value configures Data Deduplication to not optimize files smaller than 256MB. Most .vbm files are much smaller, but this size should be sufficient to cover even the largest environments metadata files.
Set-DedupVolume -Volume V: -MinimumFileSize 268435456

Additional Best Practice Information

Veeam Backup & Replication Best Practice Guide - Windows Deduplication

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Best Practices for Microsoft Data Deduplication

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Considerations and Recommendations

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