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A similar question exist which the author himself has answered by actually giving in on the question and it relates to Windows 8. I found an answer but it is for Windows 2016 Server which might be different.

I have created a mirror on Windows 2016 Server running as a VM (Oracle Virtual Box).

To test it I replaced one of my virtual disk with a new one after power down. After boot I have strangely 3 disks in concern.

  1. One disk from the mirror. Disk 1 status: Failed Redundancy, online

  2. The new unformatted disk which is supposed to be part of the mirror. Disk 2 dynamic status : online

  3. A missing disk

I tried to select the missing disk an choose "Resynchronize mirror" Nothing happened, then I tried "Reactivate volume" and I got "plex is missing"

What is plex and how do I rebuild my mirror?

user2304458
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  • @harrymc The referred link does not solve the problem, because the user in the end had to delete the mirror and create it again. One of the idea behind a mirror should be that one can replace a disk. – user2304458 Oct 20 '18 at 12:02
  • The post is still duplicate even if the answer is unsatisfactory. RAID is not as robust as it is said to be, especially if one does not follow the procedure. – harrymc Oct 20 '18 at 12:05
  • I ask what is plex? That is not the question in the other link, second what is the right procedure replacing a disk? I think I do the simplest possible. – user2304458 Oct 20 '18 at 12:18
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    Plex is another name for a disk in RAID. "plex is missing" = "disk is missing". – harrymc Oct 20 '18 at 13:56

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The solution is to choose "Remove Mirror" for the disk labeled missing, next you select the disk which already is in the mirror and choose "add mirror" a dialog box pops up and you choose the new created disk.

user2304458
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