zfs discuss - Feb 2008 - ZFS total size different when NFS mounted

Hi all,

Another issue users have pointed out with ZFS: now, when their ZFS homedirs are
automounted, the total size shown is not always correct.

All the homedirs have a 10GB quota, which means that is supposed to be the total
size shown. However, when there are snapshots on those FS, and they are
automounted via NFS, the total size is the actual quota size minus the space
used up by the snapshots, which is *very* confusing.

Let''s see an example, a homedir with a 10 GB quota, and a snapshot
using up 2 GB:
$ /usr/sbin/zfs list -r home/testcc
NAME               USED  AVAIL  REFER  MOUNTPOINT
home/testcc       2,43G  7,57G   444M  /export/home/users/testcc
home/testcc at hier  2,00G      -  2,43G  -

If I check the size locally, on the automounted homedir, using df, I get:
$ df -h /home/users/testcc
Syst?me de fichiers  taille utilis?  dispo capacit?  Mont? sur
home/testcc             10G   444M   7,6G     6%    /export/home/users/testcc

If I use the exact same command on a system with the exact same automount
config, whether Solaris or RHEL, I get:
$ df -h /home/users/testcc
Sys. de fich.         Tail. Occ. Disp. %Occ. Mont? sur
dota-cc-fichier:/export/home/users/testcc
                      8,0G  445M  7,6G   6% /home/users/testcc

See2 ZGB of difference (I''ll pass on the 1MB difference on use).

Even locally, it is incoherent:
$ df -h |grep test
home/testcc             10G   444M   7,6G     6%    /export/home/users/testcc
/export/home/users/testcc   8,0G   444M   7,6G     6%    /home/users/testcc

What is the reason of such a difference?

Laurent
 
 
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