Error 5: Failed boot mirrored drive USB + M.2

[bastianlstrube]

Hello!
I have a server that refuses to boot with these mirrored boot drives:
Samsung M.2 ssd
Sandisk Cruzer Blade

On booting I get the following errors
(da0:umass-sim0:0:0:0):Error 5, Retries exhausted

I replaced one of the original 2 usb boot drives with the m.2 ssd just last year.
Upgraded to Truenas just last week, where I also did a successful shutdown and boot.
Seems odd that they should both fail now. It is possible for Truenas to boot of off just one of the mirrored drives right?
I don't know what to do to check whether my drives are alive...
Should i boot a live usb of something?? will ubuntu do?
If I reinstall Truenas, can i import a config from previous Freenas 11.3 release?

Shutdown was to add 2 x 16 GB ECC kingston ram to this setup:
Xeon E5-1230v6
2 x Kingston Valueram 8 GB ECC
6 x HGST Ultrastar 7K6000
SuperMicro X11SSH-LN4F
Supermicro kabinet

Thanks!

 

[bastianlstrube]

I've booted a usb with Truenas 12... got into the shell and "camcontrol devlist" only list me my 6 harddrives, and 2 usb drives, one of which is the Sandisk that it seems to refuse to boot from.

Is my m.2 nvme ssd dead?!? :'(

 

[bastianlstrube]

It seems the installer, which I haven't gone through with can see the 120 gb nvme drive.
So now I am doubly confused why it doesn't boot.
Could this have anything to do with the EFI partition being on the Sandisk Cruzer?!?