vsftpd weird issue with nfs mount missing nolock option

Just had weird issue with nfs mount.

A folder access vsftpd, can view the file, but can't download.

The first one linked to NetApps, it works without nolock option.
The second linked to RHEL 4 nfs service, it only works with nolock option.

# cat /etc/fstab

10.144.246.12:/vol/ftp_storage        /home/storage         nfs     rw,bg,hard,tcp,rsize=32768,wsize=32768,timeo=600        0 0
192.168.190.118:/home/storage        /home/storage/storage_DND/nrm  nfs     rw,bg,hard,nolock,tcp,rsize=32768,wsize=32768,timeo=600        0 0

The second nfs mount was within the first nfs mount.