Which Offers Better Deduplication?

[sanman2304]

Which protocol offers better or more efficient deduplication, NFS or iSCSI?  Or does it even matter?

[brendanheading]

The way that you access the raw data does not effect the deduplication outcome.

I'd expect slightly worse deduplication results on an iSCSI/FCP LUN depending on the nature of the filesystem being used with it.

[sanman2304]

Do you know of any technical reports comparing NFS volumes to volumes with LUNs for deduplication results?

[brendanheading]

The deduplication yield is a function of the kind of data being stored on the volume, not the protocol used to access it. The choice between either depends on what you're doing. Personally I try to do everything with NFS and avoid using LUNs where I can for flexibility reasons.