Explain how RAID 1 works???

Question

RAID

Good afternoon.
As far as I understand - with raid 1, data is mirrored to the second disk, and if 1 of the disks fails, the SYSTEM SHOULD CONTINUE WORKING (correct if it's wrong). I have a server with raid 1 of 4 disks. a flash drive with the VMWare hypervisor is inserted into it, and the raid itself plays the role of a storage. Yesterday 1 disk died, the server room was filled with a terrible squeak, and I went to see what and how - only 1 out of 4 disk flew out, but the system didn’t want to see the storage point-blank until I threw in the fourth disk and did a rebuild. Previously, in practice, I didn’t have to restore raids, so my doubts crept in - should the mirror work if 1 disk fails, or does it just store data, but a completely healthy raid is needed for the system to work ???

Answer 1

The system must continue to work.
This is the only point in building a raid with data redundancy - to continue working if the disk specified by the level of the raid drops out. There is no longer any point in making an array with redundancy, this is by no means a backup.
raid1 on 4 disks, so you need SUCH storage redundancy, but you have not checked the behavior of the controller? This is weird.