LABEL=/                 /                       ext2    defaults              1
1 # /dev/hda6
LABEL=/backup           /backup                 ext2    defaults               
1 2 # /dev/hda5
LABEL=/boot             /boot                   ext2    defaults               
1 2 # /dev/hda1
LABEL=/home             /home                   ext2    exec,dev,suid,rw       
1 2 # /dev/hda7
/dev/cdrom              /mnt/cdrom              iso9660 noauto,owner,ro         0 0
/dev/fd0                /mnt/floppy             auto    noauto,owner            0 0
LABEL=/opt              /opt                    ext2    defaults               
1 2 # /dev/hda3
LABEL=/ora/data01       /ora/data01             ext2    defaults               
1 2 # /dev/hda8
LABEL=/syb/data01       /syb/data01             ext2    defaults               
1 2 # /dev/hda9
LABEL=/tmp              /tmp                    ext2    defaults               
1 2 # /dev/hda11
LABEL=/var              /var                    ext2    defaults               
1 2 # /dev/hda10
LABEL=/opt/httpd        /opt/httpd              ext2    defaults               
1 3 # /dev/hda13
none                    /proc                   proc    defaults                0 0
none                    /dev/shm                tmpfs   defaults                0 0
none                    /dev/pts                devpts  gid=5,mode=620          0 0
/dev/hda12              swap                    swap    defaults                0 0

I solved the problem. My fstab file consisted of a comment at the end of the 
line. 'fstab' file is read using a format mask "%-23s %-23s %-7s %-15s %d %
d\n", so any chars at the end of the line caused that the line did not match a 
format and was not read. That why the root partition was not seen.
        
File fsset.py
def fstab (self):
        format = "%-23s %-23s %-7s %-15s %d %d\n"
        ....