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Won't, as backplane have both SATA and Molex power socket, you may loop them each other to ensure power draw share well to PSU power port. I means connect all SATA and Molex to 450w PSU.

450w PSU defintely enough, the remain problem are could you well connect 9 disk from 2 peripheral power port ( 450w ) instead 3 peripheral port ( 750w ).

A straightforward way was replace the compute unit, but you may save 100w - 150w endup. Would you willing spent that cost which hard to overcome the electricity bill ? PS : Recently, I buy Minisforum N5Air, but I am not using it as NAS, I detach the compute unit to replace my main Windows PC ( Intel 9600K ), it run faster and draw half power. It equip 10G and 5G ethernet, Oculink and PCIe slot. May be one day, it will return back be NAS and replace my X299 unraid build and connect 28 disks.

This seems a good idea, most people will simple recreate the pool and copy back data, appreciate for those script.

Then no br2.11 and replace with eth2.11

Did you try disable bridge, I upgrade to 7.3.1 with macvlan and not enable host access. All IOT device haven't problem to connect their vlan to docker.

Both capture ( text & pic ) show have 10000baseT and both negotiation at 10000Mb/s

Switching power supply usually are common AC earth and the DC ground. But P3 Tiny use external power supply, this type PS may not in same condition. SATA/SAS are differential signal, there are argument should ground for both-end ..... below post have point out a good example, will you ground all equipment if they are connect with ethernet cable ? But I would say ethernet case have some different, because there are a small transformer inside the ethernet port. https://www.edaboard.com/threads/differential-signaling-and-ground-referencing.307250/ BTW, personally I will add extra ground wire to both end's DC ground.

This is mini PC, maximum allow two M2 only. Old config are 256GB for boot pool with 64GB boot partition, remaining 174GB use for backup. Other 2TB standalone. But due to want dual device boot pool, so combine them ...... now only have one boot partition and one data partition. What means expand ? Replace the 256GB to bigger one ? Thanks

Yes, success migtate to TPM, but I haven't expect so much trouble. I read different post before starting. I also change boot pool to dual device with 256GB and 2TB. Config to 64GB boot partition and the remaining in single mode btrfs fs share, did @JorgeB have any advice if only base on config setting. Tks

Continue on below post After reboot, same error show again, but this time have a new option "Recover License Key" Finally, "recovery key" solve all problem, but play safe, I further reboot one more time to confirm. The registered date also change !!!

Just try to migrate to TPM, I got same error. But do one more step click "Manage License", let unraid.net have update license info. then error gone and success go to next step "Move to TPM" But click Move to TPM, then a big trouble happen, system stop immediately due to key problem, after input the key URL, then "missing key file" error also gone. But "Start" button still dim ..... so I must reboot.

I use same switch, I insert one 10G and one 2.5G converter to it, both work well for year, those are new gen chips solution and running cool ( feeling won't over 50c, 2.5G one just slightly warm ) BTW, all info. are dead hard, it won't change and meaningless. Agree.

NIC plugin which PCIe slot ？Only Most left are PCIe 3.0, other are 2.0 And such old platform may not handle 10g network environment.

All are depends on system design, there are no correct or wrong. You can design continue balancing also fine. The key point are when balancing start, how much power will waste, that's why you will found balancing start in above conditions for old type balancer. Balance current are depends on cell voltage different and the max current of the balancer support, unless you have boost circuit to speed up that process. In fact, charging different battery are dealing on current / voltage, that's not proper comparison.