mount.nfs4 gives invalid argument

NFS server: Linux sarchx64 4.8.13-1-ARCH #1 SMP PREEMPT Fri Dec 9 07:24:34 CET 2016 x86_64 GNU/Linux
(+ another one running linux-lts)
NFS client: Linux odroid-001e06337421 3.14.79-14-ARCH #1 SMP PREEMPT Sat Dec 10 11:42:30 MST 2016 aarch64 GNU/Linux

On the server every thing seems fine:
$this->bbcode_second_pass_quote('', '
')richard@sarchx64:/home/richard$ sudo mount.nfs4 -vv sarchx64.local:/export/pub /mnt
mount.nfs4: timeout set for Thu Jan 5 05:57:57 2017
mount.nfs4: trying text-based options 'vers=4.2,addr=192.168.0.2,clientaddr=192.168.0.2'
richard@sarchx64:/home/richard$ mount |grep mnt
sarchx64.local:/export/pub on /mnt type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.2,local_lock=none,addr=192.168.0.2)
richard@sarchx64:/home/richard$ sudo umount /mnt
richard@sarchx64:/home/richard$ sudo mount.nfs4 -vv -o vers=4.2 sarchx64.local:/export/pub /mnt
mount.nfs4: timeout set for Wed Jan 4 19:37:39 2017
mount.nfs4: trying text-based options 'vers=4.2,addr=192.168.0.2,clientaddr=192.168.0.2'
richard@sarchx64:/home/richard$ mount |grep mnt
sarchx64.local:/export/pub on /mnt type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.2,local_lock=none,addr=192.168.0.2)
richard@sarchx64:/home/richard$ sudo umount /mnt
richard@sarchx64:/home/richard$ sudo mount.nfs4 -vv -o vers=4 sarchx64.local:/export/pub /mnt
mount.nfs4: timeout set for Wed Jan 4 19:37:53 2017
mount.nfs4: trying text-based options 'vers=4,addr=192.168.0.2,clientaddr=192.168.0.2'
richard@sarchx64:/home/richard$ mount |grep mnt
sarchx64.local:/export/pub on /mnt type nfs4 (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.2,local_lock=none,addr=192.168.0.2)
richard@sarchx64:/home/richard$ sudo umount /mnt

[moonman]

NFSv4 is there https://github.com/archlinuxarm/PKGBUIL ... nfig#L4553

[risto3]

okay, then I guess I'll see if I can glean more info this weekend...
in the meanwhile I have another issue seemingly involving nfs and pcmanfm, but I'll create a new thread for that.
cheers

[risto3]

Argg, seems this is more or less a server-side zfsonlinux issue where the translation to the linux syntax only does a half-arsed job (in terms of v4), necessitating redoing everything and declaring the nfs shares instead in /etc/exports.
I was able to jerry rig an nfs4 mount finally on the odroid-c2 to confirm that indeed v4 is correctly there.
cheers