zfs discuss - Feb 2009 - ? Oracle parameters for ZFS : disk_asynch_io & filesystemio_options

Could someone help me answer the following question :

What is the recommanded value for these 2 Oracle parameters when working 
with ZFS ?

disk_asynch_io = true
filesystemio_options = setall

or

disk_asynch_io = false
filesystemio_options = none

Thanks in advance.
MiK.