I've got a similar problem trying to break down a RAID1 array to use the
individual partitions for swap. From what I understand the array was
created during installation and marked as swap, then had a single
partition removed from it (currently activated as swap).
$ uname -a
Linux adlai 2.6.24-23-server #1 SMP Mon Jan 26 00:55:21 UTC 2009 i686 GNU/Linux
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu 8.04.2"
$ mdadm --version
mdadm - v2.6.3 - 20th August 2007
$ sudo fdisk -l
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x9e169e16
Device Boot Start End Blocks Id System
/dev/sda1 * 1 973 7815591 fd Linux raid autodetect
/dev/sda2 974 31367 244139805 fd Linux raid autodetect
/dev/sda3 60668 60801 1076355 82 Linux swap / Solaris
/dev/sda4 31368 60667 235352250 fd Linux raid autodetect
Partition table entries are not in disk order
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x07a6b49b
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 973 7815591 fd Linux raid autodetect
/dev/sdb2 974 31367 244139805 fd Linux raid autodetect
/dev/sdb3 60668 60801 1076355 82 Linux swap / Solaris
/dev/sdb4 31368 60667 235352250 fd Linux raid autodetect
Partition table entries are not in disk order
(snip)
$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md3 : active raid1 sda2[0] sdb2[1]
244139712 blocks [2/2] [UU]
md4 : active raid1 sda4[0] sdb4[1]
235352128 blocks [2/2] [UU]
md2 : active raid1 sdb3[1]
1076288 blocks [2/1] [_U]
md0 : active raid1 sda1[0] sdb1[1]
7815488 blocks [2/2] [UU]
unused devices: <none>
$ swapon -s
Filename Type Size Used Priority
/dev/sda3 partition 1076344 112 -1
$ sudo mdadm --stop /dev/md2
mdadm: fail to stop array /dev/md2: Device or resource busy
$ sudo mdadm /dev/md2 --fail --verbose /dev/sdb3
mdadm: set /dev/sdb3 faulty in /dev/md2
$ sudo mdadm /dev/md2 --remove --verbose /dev/sdb3
mdadm: hot remove failed for /dev/sdb3: Device or resource busy
The only other thing I can think of is booting from a livecd and zeroing
the superblock / running mkswap, but that will probably take a while to
schedule downtime for.
--
cannot stop RAID1
https://bugs.launchpad.net/bugs/371338
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