Hi Benoit,
I had the same issue but in different environment which is AIX and NAS. It's turn out the problem on cache configuration in NAS. So I think the issue is related with OS and ZFS configuration.
Could you review these scn and notes.
http://scn.sap.com/thread/752504
notes:
Note 1343733 - Support for SAP on ZFS
Note 832871 - SAP relevant patches for Oracle Solaris 10 on SPARC
Is this the only system with ZFS and Oracle? if not do you have the same issue on another system?
Regards,
Achmad
