I'm using the built-in software raid from freenas.
Perhaps I explain what I did exactly. I was running freenas 9.2.1.8 (or maybe 9.2.1.9, I can't remember surely) on a pretty old Pentium 4 32bit/386 machine. So I was limited to 4 GB RAM.
Freenas started on a 8 GB USB-Stick and I've installed two 2 TB HDDs in RAID1 (mirror) mode.
I've downloaded the Webinterface-Update for freenas 9.3 (FreeNAS-9.3-RELEASE.GUI_Upgrade.txz an installed it from the GUI/Webinterface. Before I've started I saved the config-db as it said. I started the update. It said, everthing went ok and the system would reboot. It shut down, but didn't start again, there was only the cursor blinking.
I guessed, my old motherboard with a bios from 2005 wouldn't be able to handle the GPT Partition. So I've started on the machine itself (not via GUI/Webinterface) the FreeNAS-9.3-RELEASE.iso. (Don't know if this was the 64- or 32-bit edition? Or does it choose it automatically?) The installer asked me to upgrade. So I choose to "upgrade". But now it didn't start anymore, I guess it was because it was the 64-bit edition.
So I've formated the usb-start-stick. I hope this wasn't a terrible fault, but I thought I have the config.db and there was a info in a readme-file, I could also try it with a fresh install, import the config.db and all fine. So I did.
Finally I got it work again with freenas 9.3 (on a new 64bit machine) and also on the old machine (Pentium 4, 32bit/386) with 9.2.1.9. Everthing looks nice, of my config. But if I want to decrypt my volume(s) it gives me the above mentioned errors.
Do you think there is any hope to get my data back? It would be so nice to have them back

. Thanks so much - I really appreciate any help or futher info on this issue(s)!
P@sco