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Migrating a Synology NAS to a UniFi UNAS Pro 8 with Robocopy, SMB Multichannel, and Surprising Performance Traps

Scott Hanselman · 23 Aug 2026 · feeds.hanselman.com ↗

2 korrents from this piece

Scott Hanselman did not write this page.

Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.

  1. Our reading

    Performance-related command-line flags represent qualitative changes to restartability, buffering, or concurrency, not levels on a continuous performance dial.

    Their words/Z, /J, and /MT are not levels on a performance slider. They change restartability, buffering, and concurrency.

  2. Our reading

    A server's real network throughput can exceed what its single fastest port suggests when a protocol supports channel bonding across multiple links.

    Their wordsSMB Multichannel can make an old NAS with several gigabit interfaces much more capable than one might assume from looking at any single Ethernet port.