JorgeB

Isso é normal, usa o predefinido high-water, é o método de alocação recomendado, assim que todos os discos estiverem a 50% volta a escrever para o disco1, mas é possível mudar para fill up se preferires. 

You can blacklist the GPU driver in use, assuming it's not needed to anything else.
https://docs.unraid.net/unraid-os/release-notes/6.10.0#linux-kernel

Cancel the rebuild, check/replace cables on disk2, try again.

There are issues with almost all devices connected to the Asmedia controller, that controller uses SATA port multipliers and because of that is not recommended, see here:
 

There's no disk8 now, but it's still set to exclude it, it's not a problem now, but it can be if you add a disk8 in the future, you can edit /boot/config/shares.cfg and change shareUserExclude="disk8" to shareUserExclude="".

You can create a redundant pool with two or more devices.

Most likely, you might want and check the old disk, if it's not completely dead most data should be recoverable, ddrescue may help.

If you can it will be much faster.
 
Use rsync, it can easily be resumed.

Still points to an OS issue/configuration, a clean reinstall should fix it.

See here:
https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480418
 
I believe like the FAQ mentions removing a device from a two way mirror will leave you with a degraded mirror, no big deal since it's will have the same redundancy, i.e. none, as a single device, but please let men know if it's different now since it's not easy for me to test today.

SMART looks fine, some UDMA CRC errors suggesting a bad SATA cable, assuming they are recent.

If both original devices are 512GB it won't accept a 500GB device as a replacement, and even if only one was probably still wouldn't, suggest getting same or large capacity device.

1 works, for 2 best to copy only bz* files and changes.txt outside /config

You can also do this:
https://forums.unraid.net/topic/143234-basic-too-many-attached-devices-to-activate/?do=findComment&comment=1292305
 

Flash drive issues since the 25th, power down and try a different USB port, ideally USB 2.0, if issues persist replace the flash drive.

Yes and how much it will affect you depends on what was there, for example if you had docker and VMs on cache you'll lose that, obviously any other data there will also be lost.

Looks more like a power/connection problem, try replacing the cables or using a different PSU if available.

Please use the exiting support thread, for the future you can easily find it by clicking on the container and then support.
 
 

There's something else writing do disk6.

Parity and disk2 are reporting read errors, almost simultaneously, disks look OK though, replace the cables and post new diags after array start.

You need to contact support from the email the license was purchased with the old and new GUIDs.

The NIC is being detected and the driver loading, but you have this problem:
https://docs.unraid.net/unraid-os/release-notes/6.12.0#crashes-related-to-i915-driver
 

Yeah, but it also mentions "Total devices 2", so there shouldn't be a third device, try physically disconnecting that device and starting the pool with the two existing ones, if it still doesn't mount post new diags after array start.

Disk was already disabled at boot, so we can't see what happened, SMART looks OK, suggest replacing cables to rule that out and if the emulated disk is still mounting and contents look correct you can rebuild on top.
 
https://docs.unraid.net/unraid-os/manual/storage-management#rebuilding-a-drive-onto-itself