I have the same issue only my drives are all showing as failed in disk manager (Storage > Disk Manager)
HDD 4 Unassigned 1.36 TB WDC WD15EARS-00Z5B1 Failed
HDD 3 Unassigned 1.36 TB WDC WD15EARS-00Z5B1 Failed
HDD 2 Unassigned 1.36 TB WDC WD15EARS-00Z5B1 Failed
HDD 1 Unassigned 1.36 TB WDC WD15EARS-00Z5B1 Failed
I have even tried moving the drives to another sharespace with the same issue
Any ideas on what I can do to get the drives back online and get the data off
Tried SSH and got the following issue
$ mdadm --assemble /dev/md2 /dev/sda4 /dev/sdb4 /dev/sdc4 /dev/sdd4
mdadm: /dev/md2 assembled from 2 drives and 1 spare - not enough to start the array.