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12:22 PM
@JennyD A little late, but nevertheless, congratulations to making that list! (From another frozen Swede in front of a keyboard).
 
 
1 hour later…
1:28 PM
@maulinglawns Thanks!
 
2:09 PM
@VlastimilBurian since you deleted the question, I'm continuing the discussion here
a vote to close isn't a request to delete
your question would have remained, just with a pointer to the other question
if you think an existing Q & A are unclear, the solution isn't to add a new Q & A but to edit the existing one
 
 
7 hours later…
9:17 PM
md126 : active raid1 sdk2[1](F) sdb2[2]
      9767448 blocks super 1.2 [2/1] [U_]
      bitmap: 0/1 pages [0KB], 65536KB chunk
⋮
# mdadm -a /dev/md126 /dev/sda2
mdadm: /dev/md126 has failed so using --add cannot work and might destroy
mdadm: data on /dev/sda2.  You should stop the array and re-assemble it.
... wtf
Oh dear, Google reminds me I've had this problem before
5
Q: Why does mdadm believe my raid1 "has failed so using --add cannot work"?

derobertTLDR: Trying to add a blank partition to a degraded RAID1 with mdadm 3.3.2 (Debian Jessie) fails, saying the (perfectly working!) array has "failed" and "--add cannot work". Is it telling me of a real danger here, or have I just hit some weird bug? Detailed Version Overnight, I had a disk die. ...

Apparently I lost the mdadm patch at some point.
 
9:40 PM
@derobert congrats on writing up a solution that you can use twice! :)
 
Hah, yep! Glad I wrote it up.
 
10:02 PM
I too have had the odd experience of having a question, doing a search and finding an answer, by me. Which I'd forgotten about.
 

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