From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mitchell Laks <mlaks@verizon.net>
Subject: Re: How to move a singleton raid1 drive from raid1 /dev/md2 to /dev/md1
Date: Fri, 08 Apr 2005 00:29:39 -0400
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Thanks you Neil!!

i am running debian sarge with 1.9 and kernel 2.6.8
I followed  your instructions 

  mdadm -S /dev/md2  # shutdown md2 and release hde1
  mdadm /dev/md1 -a /dev/hde1 # add hde1 as a spare in md1
  mdadm -G -n2 /dev/md1 # grow md1 to have two devices.

and now

wustl@A1:~$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hdb1[0] hdg1[1]
      244195904 blocks [2/2] [UU]

md1 : active raid1 hde1[1] hdc1[0]
      244195904 blocks [2/2] [UU]


Yay!!!

Thank you very much.

Mitchell