Reading NAS disk when NAS has failed

Assuming the array in the Ultra 2+ is fine, you should be able to move the disks across to a 312, backup your data, do a factory default (wipes all data, settings, everything), then restore your data from backup.

It would be advisable to put a spare disk (must not be from your array) in the 312, update the firmware to the latest, verify the update was successful, power down, remove the spare disk, then migrate your disks across.

It is important that you boot the NAS normally and don't do an OS re-install. An OS re-install would try to put OS6 on the disks, which is not what you want till your data is recovered.


However your two disk array is no longer redundant. It is recommended to only migrate redundant arrays where possible, but hopefully a single disk from your two disk array should work.

I certainly would not recommend buying a legacy model for more than the price of a new model.


To mount the data volume in Ubuntu you would need to do something like this in the Terminal:

# mdadm --assemble --scan
# vgscan
# vgchange -a y
# mount -o ro /dev/c/c /mnt

Where /mnt is the mount point (could be something else, the above is just an example).

If it complains about missing packages you would need to install those:

# apt-get update && apt-get install mdadm lvm2

Then try again.

when you are done:

# cd
# umount /mnt
# vgchange -a n
# mdadm --stop --scan

Note however that if you attempt data recovery yourself you can reduce the chances that someone else can help you recover your data if it comes to that (as you have found as one of your disks has been wiped).