I've got a two disk raid and I want to it and convert the disks to some non-raid usage. The raid was never used and has no data. Also, the raid disks are encrypted along with the rest of the disk in the machine. When I try to stop raid I get the following: # mdadm --stop /dev/md127 mdadm: Cannot get exclusive access to /dev/md127:Perhaps a running process, mounted filesystem or active volume group? Googling about this there are a number of folks hitting this problem over a number of fedora releases. Sadly, I could not find any fix. For some the solution (nuclear solutions) was to use a different linux distro or reinstall. I've got a lot of data on other disks on this system and really don't want to use a nuclear solution. Background information: $ uname -a Linux medusa 3.17.7-200.fc20.x86_64 #1 SMP Wed Dec 17 03:35:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux MDADM # mdadm --misc --detail /dev/md127 Version : 1.2 Creation Time : Fri Apr 25 17:19:52 2014 Raid Level : raid1 Array Size : 3906885632 (3725.90 GiB 4000.65 GB) Used Dev Size : 3906885632 (3725.90 GiB 4000.65 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Sun Feb 1 09:37:32 2015 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : localhost.localdomain:raid1 UUID : be78cb55:f26bbf2b:7ad9b344:a2427875 Events : 8527 Number Major Minor RaidDevice State 0 8 33 0 active sync /dev/sdc1 1 8 49 1 active sync /dev/sdd1 MDADM.CONF # cat /etc/mdadm.conf # mdadm.conf written out by anaconda MAILADDR root AUTO +imsm +1.x -all ARRAY /dev/md/raid1 level=raid1 num-devices=2 UUID=be78cb55:f26bbf2b:7ad9b344:a2427875 LSOF # lsof | grep md127 md127_rai 1044 root cwd DIR 253,1 4096 2 / md127_rai 1044 root rtd DIR 253,1 4096 2 / md127_rai 1044 root txt unknown /proc/1044/exe udisksd 2120 root 13r REG 0,15 4096 30332 /sys/devices/virtual/block/md127/md/sync_action udisksd 2120 root 14r REG 0,15 4096 30345 /sys/devices/virtual/block/md127/md/degraded gmain 2120 2121 root 13r REG 0,15 4096 30332 /sys/devices/virtual/block/md127/md/sync_action gmain 2120 2121 root 14r REG 0,15 4096 30345 /sys/devices/virtual/block/md127/md/degraded gdbus 2120 2123 root 13r REG 0,15 4096 30332 /sys/devices/virtual/block/md127/md/sync_action gdbus 2120 2123 root 14r REG 0,15 4096 30345 /sys/devices/virtual/block/md127/md/degraded probing-t 2120 2124 root 13r REG 0,15 4096 30332 /sys/devices/virtual/block/md127/md/sync_action probing-t 2120 2124 root 14r REG 0,15 4096 30345 /sys/devices/virtual/block/md127/md/degraded cleanup 2120 2125 root 13r REG 0,15 4096 30332 /sys/devices/virtual/block/md127/md/sync_action cleanup 2120 2125 root 14r REG 0,15 4096 30345 /sys/devices/virtual/block/md127/md/degraded FSTAB ENTRY /dev/mapper/luks-ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 /raid1 ext4 defaults,x-systemd.device-timeout=0 1 2 BY-UUID # ls -l /dev/disk/by-uuid/ | grep md127 lrwxrwxrwx. 1 root root 11 Jan 10 19:32 ab8911f9-b3a4-4f33-8b10-7e52c7217ae9 -> ../../md127 Thanks Richard