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[johnny.lau]

I did another test copying files (798MB) from Volume 1 (RAID 1) to Volume 2 (JBOD).

Somehow, the transfer speed is different when I did it from computer attached to CAT6 and Modem/Router as opposed to via wireless.

My understanding is copying files from volume 1 to volume 2 should be considered within local drive of NAS. It should not affected whether it is administered via wireless or wired.

Can someone please explain?

[JavaLawyer]

How are you copying the files?

If you drag drop files from Volume_1 to Volume_2 from Windows (i.e. from your PC desktop), the files are actually copied twice: (1) the data is copied from the DNS-327L Volume_1 to your PC; and (2) copied from your local PC back to the DNS-327L, Volume_2.

If you schedule a local backup from within the DNS-327L web UI, then the data transfer will be confined to within the DNS-327L and completely independent of your network, which will result in a much faster transfer rate.

[johnny.lau]

Thanks for the clarification. That makes sense now. In fact, that was what I did.