The exported filesystem on netapp is - /vol/vol0/studies.
There is single filesystem under /vol/vol0 while /vol/vol0/studies
has just it's own qtree.
On VE the root filessystem is under /vz/private/VEID as usual
and serveral nfs3 mounts where /home/studies/ is:
# df /home/studies/
Filesystem 1K-blocks Used Available Use% Mounted on
netapp3:/vol/vol0/studies
671088640 357937592 313151048 54% /home/studies
#
So /home is local VE filesystem.
To remind you - the problem appeared simultaneously on all VEs(on same HN) that mount netapp3:/vol/vol0/studies, and only for this mountpoint. I did not find any clue for problems in HN. After I rebooted the HN the problem dissapeared, but i'm affraid it my aprear again on any of my HN.
Thanks