Re: Can't create RAID 0 with Debian Lennny and mdadm on EC2
Raleigh Guevarra <firstname.lastname@example.org> wrote:
> We're trying to make a RAID 0 with four 150Gb each of volumes but we
> are getting this error [...] on Amazon EC2
> # mdadm --create /dev/md0 --level 0 --metadata=1.1 --raid-devices 4 /dev/sdl /dev/sdm /dev/sdn /dev/sdo
> mdadm: /dev/sdl appears to be part of a raid array:
> level=raid0 devices=4 ctime=Thu Apr 30 20:48:41 2009
> # mdadm --create /dev/md0 --level=0 --raid-devices=4 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1
> mdadm: Cannot open /dev/sdl1: Device or resource busy
You appear to be trying to use a device that's already part of a RAID
array to create a RAID array. You can't do that.
Take a look at output of /proc/mdstat to see what your system thinks
are RAID devices.