The magic of ZFS and NFS (2nd try)

Christian Baer christian.baer at uni-dortmund.de
Fri Feb 20 19:15:14 UTC 2015


Hi everyone!

I've already asked this question (basically) in the questions list, but I 
didn't get anything that really helped me along. I am hoping to get a little 
further on this list.

Using my search engines, I have found out that exporting a ZFS is a by 
picky. However I have found no general rules of what to do - yet.

My file server is called obelix, my workstation falbala. Feel free to make 
fun of that fact. :-)

obelix boots from an SSD. There is a raidz2 configured with 7 HDDs, mounted 
under /zfs/arc1. This is the main (basic, root) mount point of the ZFS pool 
and it is pretty much empty. There are other tanks I have defined and they 
are under /usr/archive/. The directory /usr/archive/ is of course still part 
of the SSD.

When I set /usr/archive as an export in /etc/exports, I can mount that from 
falabala. I see all the subdirectories too - each of these are ZFS tanks. 
However, I cannot access the contents of the tanks. I've played around here 
a bit and there are two things that can happen:

1. I can dive into the directories but they look empty from falbala.
2. Access to the directories is refused completely.

I don't remember what I did to get each of these results, so please don't 
ask. :-)

Ok, so I read that I cannot export all ZFS mounts together like this and 
have to create an export for each seperately. Fine with me. :-)

So I created and export to /usr/archive/shared which is the mount point of a 
ZFS tank. But if I try to mount that via NFS from falbala, the connection is 
denied completely. This is logged in /var/log/messages on obelix - without 
any reason however.

Now it might be that I am just to dumb to understand the works of NFS and 
ZFS or I am just missing a piece of the puzzle. Can someone please give me a 
push, please?

Regards,
Chris



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