It's a linux raid, and specifically the output of /proc/mdstat
Letter S in sdc1 (S) - designates spare disk instead of the disk array. What do you have in the array md1 no data drive. Irreversible loss sushestvovala data, there is no place to write a new one. Because the array is translated in a status of inactive, it is useless and requires administrator intervention.
Where in raid1 might be the only one to spare - for example, do not have time to sync data.
albert.Kulas45 answered on April 7th 20 at 10:59
before creating the array, I removed the superblocks on the disks?
Eco you shakes.
Do not delete the superblocks, this is the heart of ext4, for example.
On screen - the regular output of mdadm with information about the blocks, everything is fine.