QA

No Network Traffic from SMB Copy for Same Server

Q: Why don't I see any network traffic from a machine performing file copies between SMB shares that reside on the same SMB server?

A: SMB has always had a feature called COPYCHUNK. When you copy files via SMB, where the source and target are on the same file server (which could be the same share or different shares—just needs to be the same file server) and the data is greater than 64KB, then the copy is performed locally on the file server and no traffic actually goes over the network via the SMB client performing the actual copy. This looks very similar to ODX, which is a technology on SANs to accomplish something very similar.

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