Re: mdadm: SET_ARRAY_INFO failed for /dev/md0: File exists

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> What does
>   cat /proc/mdstat
> show?  I suspect /dev/md0 has already been assembled somehow.

platinum:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5]
md3 : active raid1 hdc1[1]
      20000768 blocks [2/1] [_U]

md1 : active raid1 hdc2[1]
      40001728 blocks [2/1] [_U]

md2 : active raid1 hdc3[1]
      40001728 blocks [2/1] [_U]

unused devices: <none>

But how??? I didn't build it.  Is it possible to remain after installs?  Can
I delete an md?  If so how?

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