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Jenny D

1:28 PM

@maulinglawns Thanks!

Stephen Kitt

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…

derobert

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

Q: Why does mdadm believe my raid1 "has failed so using --add cannot work"?

TLDR: 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. ...