Comment 2 for bug 436527

update:

I removed my existing /etc/exports and wrote a new one after reading http://www.ubuntugeek.com/nfs-server-and-client-configuration-in-ubuntu.html

:

/pub 10.0.0.0/24(rw,no_root_squash,no_subtree_check)
/pub2 10.0.0.0/24(rw,no_root_squash,no_subtree_check)
/p 10.0.0.0/24(rw,no_root_squash,no_subtree_check)

df -hT on client now:
10.0.0.2:/pub nfs 2,3T 1,1T 1,2T 48% /pub
10.0.0.2:/pub2 nfs 1,8T 915G 827G 53% /pub2
10.0.0.2:/p nfs 299G 49G 250G 17% /p

so perhaps its not a bug afterall, but I still find it peculiar that my old exports worked in 9.04 and not 9.10...