I have this same issue with my nfsv4 mounts in ubuntu 10.04 running inside virtualbox.
_netdev is completely ignored in fstab.
For NFS mounts, this renders the system not only unusable, but unrecoverable without a livecd. Even trying to boot in system rescue mode, the boot freezes and fails.
I had to recover my system by booting into a live cd, mounting my disk and commenting out the nfs mounts in fstab.
I have this same issue with my nfsv4 mounts in ubuntu 10.04 running inside virtualbox.
_netdev is completely ignored in fstab.
For NFS mounts, this renders the system not only unusable, but unrecoverable without a livecd. Even trying to boot in system rescue mode, the boot freezes and fails.
I had to recover my system by booting into a live cd, mounting my disk and commenting out the nfs mounts in fstab.