Re: Self inflicted reshape catastrophe

On Thu, Jan 14 2021, Nathan Brown wrote:

Scenario:

I had a 4 by 10TB raid 5 array and was adding 5 more disks and
reshaping it to a raid6. This was working just fine until I got a
little too aggressive with perf tuning and caused `mdadm` to
completely hang. I froze the rebuild and rebooted the server to wipe
away my tuning mess. The raid didn't automatically assemble so I did
`mdadm --assemble` but really screwed up and put the 5 new disks in a
different array. Not sure why the superblock on those disks didn't
stop `mdadm` from putting them into service but the end result was the
superblock on those 5 new drives got wiped. That array was missing a

What does this mean "the superblock on those 5 new drives got wiped"?
How do you think that happened.
Can you please report the current super blocks (mdadm --examine) anyway
please.

NeilBrown