Looks like a flash problem, if you use another flash drive you'll need to reassign the disks (because of being a trial key), but you can keep all the data/existing config.
Parity disk is a shucked My Book USB device (though I remember some people buying these as if they were internal drives a few years ago), anyway that's why it's slightly smaller, you can use the parity swap procedure.
GUI is showing 1 error for disk2, until you reboot or clear the errors FCP will alert about that, disk itself looks OK so it could be a connection issue, keep monitoring.
That is failing because of the normalized value, that's the one that counts, and not a good sign unless it's some firmware glitch, keep an eye on it.
Which drives fail to run SMART tests?
Start by running memetes, if no errors boot in safe mode and leave all the dockers/VMs off, if stable for a couple of days like that start enabling them one by one.
This is not a good sign:
ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE
1 Raw_Read_Error_Rate POSR-K 200 200 051 - 3765
You can run an extended SMART test.
It's not a driver issue, no NIC is being detected, this is a hardware issue, if it was a driver issue the NIC would still be detected, jut not installed or initialized.
Yes, but you'd need to pass-trough the disk to the VM, and use the device ID and also specifying the partition, e.g. /dev/sdb1, it would be easier if you booted with a live USB key, but the desktop would be unusable while doing that.
That Microserver uses ECC RAM, so unlikely to be a memory problem, could be a disk but IMHO most likely to be a board/controller issue, do you have another controller you could use or another board/PC you could transplant the disks to?
Also that SMART error doesn't necessarily mean the SSD is dying, just that it's past the predicted flash life, many SSDs can last for twice that or even more.