Why is RAID1 blocked when one of the disks is removed?

Question

linux

Why, when removing (disconnecting) one of the two disks of the RAID 1 array, the array goes into the "blocks super" status:


Perhaps this is because initially, before creating the array, I did not remove the superblocks on the disks?

Answer 1

This is apparently about linux raid and specifically the output of /proc/mdstat
The letter S in sdc1[0] (S) - denotes a spare disk, not an array disk. That is, you do not have a single disk with data in the md1 array. Irreversible loss of existing data, nowhere to write new ones. Therefore, the array has been transferred to the inactive status, it is useless and requires administrator intervention.
Where could the only spare be left in raid1 - for example, they did not have time to synchronize the data.