The last time the subject of ACLs came up, I sent out a message that said the following:
I'd like to see them support all the different ACL types, Solaris, NT, Digital Unix, Irix, etc. (at least, I think the latter two have them) and have them all interoperate reasonably well. But that's no doubt a big undertaking for Netapp with very little return.
It might make more sense is to wait on a standard ACL protocol (maybe as part of NFS v4) and then implement that and everyone will talk the same language.
I hve reasons to believe the above statement is still an accurate reflection of NTAP's plans. Of course, ACLs for NT were necessary, and given the nature of the next NFS standard it may become important for them to implement Solaris ACLs as well. It will be interesting to see if they can make NT and NFS ACLs interoperate - if anyone can, I'm confident it will be Netapp. :)
Bruce