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[opensuse] /dev/md0 borked, can't mdadm --stop it, can't swapon /dev/md0
  • From: "Antryg Revok" <antrygrevok@xxxxxxxxxxxxx>
  • Date: Fri, 14 Mar 2008 14:43:29 -0400
  • Message-id: <N1N-IDCu3KH3oT@xxxxxxxxxxxxx>
and I'm damned if I can figure-out why.

# mdadm --stop /dev/md0
mdadm: fail to stop array /dev/md0: Device or resource busy

yeah? why?
*nothing* in /etc/fstab is using it!
( I commented-out the swap line )

Personalities : [raid1] [raid0] [raid6] [raid5] [raid4]
md3 is alternate-root, not having anything yet. . .
md3 : active(auto-read-only) raid1 sda4[0] sdb4[1]
1959916 blocks super 1.0 [2/2] [UU]
bitmap: 0/8 pages [0KB], 128KB chunk

md1 is lvm with tmp var usr opt & home in it. . .
md1 : active raid1 sda2[0] sdb2[1]
64484836 blocks super 1.0 [2/2] [UU]
bitmap: 6/246 pages [24KB], 128KB chunk

md2 is /
md2 : active raid1 sda3[0] sdb3[1]
1959916 blocks super 1.0 [2/2] [UU]
bitmap: 3/8 pages [12KB], 128KB chunk

md0 is supposed to be swap, but I can't get it to work. . .
. . . or stop . . .
md0 : active(auto-read-only) raid1 sda1[0] sdb1[1]
4200952 blocks super 1.0 [2/2] [UU]
bitmap: 0/9 pages [0KB], 256KB chunk


swapon --help
usage: swapon [-hV]
swapon -a [-e] [-v]
swapon [-v] [-p priority] special|LABEL=volume_name ...
swapon [-s]

swapon /dev/md0
swapon: /dev/md0: Invalid argument
Machine - root - 14:39 - Jobs = 0

Is there any other information that could help?

What gives with the /dev/md0 being "in use" when nothing is assigned to it?

fstab:
/dev/md2 / ext3 acl,user_xattr 1 1
/dev/mapper/Machine_VolumeGroup-home /home ext3
acl,user_xattr,nodev,nosuid 1 2
/dev/mapper/Machine_VolumeGroup-opt /opt ext3
acl,user_xattr,nodev 1 2
/dev/mapper/Machine_VolumeGroup-tmp /tmp reiserfs
acl,user_xattr,nodev 1 2
/dev/mapper/Machine_VolumeGroup-usr /usr ext3
acl,user_xattr,nodev 1 2
/dev/mapper/Machine_VolumeGroup-var /var ext3
acl,user_xattr,nodev 1 2
/dev/md3 /mnt/root-2 ext3
noauto,acl,user_xattr,nodev,sync 0 0
#/dev/md0 swap swap defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs noauto 0 0
debugfs /sys/kernel/debug debugfs noauto 0 0
usbfs /proc/bus/usb usbfs noauto 0 0
devpts /dev/pts devpts mode=0620,gid=5 0 0
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