If I have an entry like this in my exports file:

/vol/vol1/dir -access=host1:host2

should it be possible to mount the directory /vol/vol1/dir/subdir directly?

Yes.

And if so, what happens if I add the following entry to the exports:

/vol/vol1/dir/subdir -access=host3

Can host1 and host2 now only mount /vol/vol1/dir or can they still mount /vol/vol1/dir/subdir? (ONTAP 6.4.1)

host1 and host2 can still access /vol/vol1/dir and get to host3.

But, once they reboot and try to mount /vol/vol1/dir/subdir, they will be denied access.

Thanks, Thorsten Lemke