Software mirrored RAID Windows server 2008 collapsed - recovery features?

Question

System administration

Good morning, dear Khabravchane!
Straight to the point: server crate with 4 identical drives, Windows server 2008 (not R2).

Disk0 and Disk1 (on the screen) were merged into a mirror, but one of them fell out (Disk Manager showed 3 physical media). For a while, the system worked without a dropped disk.
After rebooting the server, the dropped disk appeared, the rest, oddly enough, changed places (before the reboot, the disk with the system was 0 and 1, disk 2 included D, F, K, and disk 3 was missing) (the situation after the reboot is shown in the screenshot) , however, the mirror was not assembled back, the state is "failed redundancy". The data on the logical drives D, F, K is up-to-date, nothing is missing, i.e. Windows itself figured out which disk to read data from.
It is clear that to restore the mirror, you need to clear one of the disks and re-create the mirror. The whole question is which of the physical media to remove? Disk 0 or Disk 1? The system log is silent like a partisan, diskpart also does not say anything intelligible.

Answer 1

I wouldn't trust the Windows software raid. In fact, he stupidly copies files and saws two independent loaders. In fact, this raid is conditional. If my memory serves me right, you need to right-click on the disk (or partition) and press sync or something like that ...
ps . Is there really no hardware raid? now each server has a minimal raid controller with raid 0|1|5.

Answer 2

1) I would check the drive. smart / holes in the disk / is it still able to breathe (if the disk is faulty, then it will be visible and clear which was the root cause)
2) As the speaker said above, a full backup and forward, try to restore.

Answer 3

It is unlikely that this is still relevant to the questioner ... But if anyone is interested, I will answer the points:
1. Reboot. Perhaps, upon reboot, an automatic checkdisk of sections of the missing screw will be made, if possible, then remember the names of the disks.
2. Failed redundancy will create duplication of disks that were once a mirror. View the last modified documents on one copy and on the second. Where the changes were a long time ago, he fell off. Most likely, this is exactly the hard drive, the sections of which were checked in paragraph 1.
3. Delete sections of the disk that fell off, create mirrors on it from the one that did not fall off.
4. Attention! If both screws are barely alive, it’s better not to delete anything, but to put in a third disk and add mirrors to it, otherwise it doesn’t turn out that there are bads on the disk, and the mirrors simply won’t rise, and the copies, albeit outdated, are deleted.