Device or resource busy
 

Hello,
I am trying to set up a mdadm raid in a new machine that I am building as a home theatre PC.
any help here would be greatly appreciated.

the machine boot just fine from /dev/sdc running ubuntu 9.10
However in gparted /dev/sda and dev/sdb show to be part of /devmapper/sil_ajbicfacbaej

Both dev/sda and /dev/sdb were drives that used to be part of a sil hardware raid on a previous machine. I would like to use them as a new mdadm raid on this new machine the old hardware card was really quite slow. the drives are now pluged into the MB and should be much faster there.


fdisk -l shows this
***********************************************
heffsvr2@heffsvr-2:~$ sudo fdisk -l

Disk /dev/sda: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000cc314

Device Boot Start End Blocks Id System

Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000cc314

Device Boot Start End Blocks Id System

Disk /dev/sdc: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000e95c0

Device Boot Start End Blocks Id System
/dev/sdc1 * 1 29367 235890396 83 Linux
/dev/sdc2 29368 30401 8305605 5 Extended
/dev/sdc5 29368 30401 8305573+ 82 Linux swap / Solaris
************************************************
cat /proc/mdstat show the folowing

heffsvr2@heffsvr-2:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
unused devices: <none>
**************************************************
Creating mdadm produces the following

heffsvr2@heffsvr-2:~$ sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda /dev/sdb
mdadm: Cannot open /dev/sda: Device or resource busy
mdadm: Cannot open /dev/sdb: Device or resource busy

************************************************** ******
I tried the command
sudo dmsetup remove /dev/mapper/sil_ajbicfacbaej

it produces no errors but does not remove it.
Any Ideas as to how to start over and use these drives in mdadm??

Thanks for your help

This may help:
You could try this command:
fuser -vm /dev/sdb1
or
fuser -vm /dev/sdb

it will tell you which process is busy with that device.

mdadm -S xxxxxx
may help you remove an existing raid