mount: dir already mounted or dir busy

[root@s2 mapper]# mount /dev/mapper/eqla /ftp
mount: /dev/mapper/eqla already mounted or /ftp busy
[root@s2 mapper]# mount -t ext3 /dev/mapper/eqla /ftp
mount: /dev/mapper/eqla already mounted or /ftp busy

[root@s2 mapper]# lsof  | grep /ftp
bash      26557       staimsp  cwd       DIR     253,10      4096   15466865 /ftpdata/st
su        26723          root  cwd       DIR     253,10      4096   15466865 /ftpdata/sta0120410
vsftpd    32228 staient  cwd       DIR     253,10      4096   15384577 /ftpdata/st
vsftpd    32228 staient  rtd       DIR     253,10      4096   15384577 /ftpdata/st
vsftpd    32231 staient  cwd       DIR     253,10      4096   15384577 /ftpdata/st
vsftpd    32231 staient  rtd       DIR     253,10      4096   15384577 /ftpdata/st
vsftpd    32231 staient    7rR     REG     253,10 103727308  175161357 /ftpdata/st120410/540778.2000.png

solution：
1.uninstall dmraid package.if some other needed package depends(like mkinitrd,mkbootdisk,system-config-kdump) use solution 2
2.add nodmraid to kernel boot option in /boot/grub/grub.conf ,restart your system.
3.no test,your can try.
#dmsetup ls;
#dmsetup remove device-name;
#dmsetup ls;
no devices found
#mount