Have a freenas 8 with 2 disks on raid(Mirror) of 1Tb each and only 1Gb Ram. I didn't notice that it only have 1Gb ram and update to Freenas 10 because i need install OpenVPN. When the system boot up it was very slow and i thing that something goes wrong and do a fresh install on the usb stick of freenas 9. After i realize it have only 1Gb i upgrade to 8Gb and install a fresh instalation of freenas 11.
Now i can't import the raid to freenas. If i do LS on server i found a mirror/Nasmirror but on import and zfs status don't apear.