03-25-2011
/dev/sdb is the entire disk, you can't mount an entire disk unless the entire disk is just one partition.
What kind of RAID is it? Is it a software raid? You may not be able to mount it until you activate it with mdadm, in which case it'll become a new device, /dev/md*.
Maybe it's activated itself already. That would explain why it thinks it's busy -- it's been "eaten" by the software RAID driver. Try ls -l /dev/md* to see if you have any software RAID devices available. And df -h for good measure to see what devices you already have mounted where.
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MOUNT(2) System Calls Manual MOUNT(2)
NAME
mount, umount - mount or umount a file system
SYNOPSIS
#include <unistd.h>
#include <sys/mount.h>
int mount(char *special, char *name, int flag)
int umount(char *name)
DESCRIPTION
Mount() tells the system that the file system special is to be mounted on the file name, effectively overlaying name with the file tree on
special. Name may of any type, except that if the root of special is a directory, then name must also be a directory. Special must be a
block special file, except for loopback mounts. For loopback mounts a normal file or directory is used for special, which must be seen as
the root of a virtual device. Flag is 0 for a read-write mount, 1 for read-only.
Umount() removes the connection between a device and a mount point, name may refer to either of them. If more than one device is mounted
on the same mount point then unmounting at the mount point removes the last mounted device, unmounting a device removes precisely that
device. The unmount will only succeed if none of the files on the device are in use.
Both calls may only be executed by the super-user.
SEE ALSO
mount(1), umount(1).
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
MOUNT(2)