On hostA (this is a Solaris9 box), when i try setfacl, i get the following error. I have also tried with different hosts (CentOS etc) with nfs4 options etc, nothing worked. But i am able to set ACLs on local filesystems on all of the machines.
My understanding is that Solaris 9 does not do NFSv4.
The old-style Solaris ACLs you can set locally (and on a Sun NFS server) are not supported by Netapp or anyone else. I'm assuming you'd need Solaris 10 and NFS4 for this to work.