REFS Allocation unit size for a volume containing virtual VHDX disks?

Ace-IT
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Hi,
To store VHDX vdisks, with NTFS, we’d use 64k but I’ve heard that 4k is recommended with REFS.
Is 4k actually correct to store VHDX on refs?
Thanks.
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Technical Architect - HA/Compute/Storage
Commented:
Just create the volume either in Server Manager or PowerShell and leave the defaults. Storage Spaces will know what to do with the setup.

We change the Interleave (storage block size) when 64KB is required for storing Veeam backups. There are other reasons to do so but that's for another conversation.

4KB is too small. Period.

Author

Commented:
Thanks,
I guess this brings me to ask if I should be using REFS for Server 2019 Hyper-v or NTFS.  I'll post that under a new topic.
Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
Standalone? No. Use NTFS.

ReFS is sanctioned on Storage Spaces and Storage Spaces Direct for workloads. SAN only for archival storage.

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