To recover data from a Linux Software Raid 1 Array assuming no logical volume management (LVM) is present. Use the following command to mount a single disk from the array:
mount -t ext4 -o ro /dev/sdX /mnt/destination
The trick is to tell the mount command what type of file system the partition actually contains. Mount it read only so you do not mess up what could be your only remaining backup copy of the data.