as the partition are set up as raind device (not make alot of sense to me on a single drive system) you need to assembele the arry before you can access it.
For example if you want to investigate the root_1 partition you give the command
mdadm --assemble /dev/md0 /dev/sda4
then mount it
mount /dev/md0 sda4
To view content
You could do same with root_2 (sda5) and the data partition (sda8)
Use for these respectively md1 and md2 as md0 is now in use for sda4 raid array
Before looking to another partition don't forget to return to system root after you have looked in mountpoint
Unfortunate I don't have the original partitions of the cloudbox, we need another member to supply these in case you need them. Uploading can be done with the telnet client by using tftp command.
However I would first check if you can assemble the array's on partition 4, 5 and 8. As when that fails I guess the cloudbox will fail to boot the lacie firmware as well as it also needs to assemble the arrays first