filesystems - mke2fs says "Device or resource busy while setting up superblock"

I'm trying to test restoring a backed up linux file system /apps (ext3 filesystem)

/dev/cciss/c0d0p7     177G  3.8G  164G   3% /apps

I ran the following command to take a dump:

/sbin/dump -0uz -f /backup_labeir1/apps.dmp /apps

Then I deleted the /apps folder:

rm -rf /apps

And unmounted it:

umount -l /apps

Next I'm trying to make the file-system

mke2fs -j -b 4096 -L data /dev/cciss/c0d0p7

after which I'm planning to do the below steps:

# mkdir /apps

# mount -t ext3 /dev/cciss/c0d0p7 /apps
# cd /apps
# restore -rf /backup_labeir1/apps.dmp .
# reboot

I've 2 questions:

1. Are my testing steps correct



2. When I run the below I get the error:
   [root@labeir2 backup_labeir1]# mke2fs -F -j -b 4096 -L data /dev/cciss/c0d0p7
   mke2fs 1.39 (29-May-2006)
   /dev/cciss/c0d0p7 is apparently in use by the system; mke2fs forced anyway.
   /dev/cciss/c0d0p7: Device or resource busy while setting up superblock

But neither the filesystem is mounted nor lsof shows me any output:

 lsof | grep /dev/cciss/c0d0p7

 lsof /dev/cciss/c0d0p7

Please help me resolve this.