Check out https://www.fs.com/c/25g-smb-switches-4247

FS have inexpensive switching and SFPs. Even if you get another brand switch I still recommend FS SFPs which can be ordered for compatibility with various vendor equipment.

Yes the one I linked was 100W / 20V / 5A

For power delivery you need a cable rated for it. Cables can have the same USB specification but different power limits.

Typically to charge a Laptop you want a cable rated for 60W power delivery or higher. I would just go with 100W rated cable as the price is reasonable.

Check out https://www.amazon.com/UGREEN-Cable-100W-Fast-Charge/dp/B07V5MKXJ1/ref=mp_s_a_1_3?crid=3G8AD8YL4Q5XE&keywords=ugreen%2B65w%2Busb%2Bc%2Bcable&qid=1692690249&sprefix=ugreen%2Busb%2Bc%2B65w%2Caps%2C370&sr=8-3&th=1&psc=1

Recordsize sets the maximum it can be for a file.

Either leave it at the zfs default of 128k or since your use case involves primarily reads of large files you could set it to 1MB.

A neat game. It took a bit of thinking to beat it at Level 7.