Storage stop enlightened me that Oracle have released a white paper with recommendation for deploying Oracle RDBMS on top of ZFS in Solaris. It have some details regarding version of Solaris (latest of course), Oracle RDBMS (any) and some basic setting for both the database and the datasets. It have some recommendation and suggestions on kernel tuning also. This is of course a good document to start with if you are looking at deploying Oracles databases on ZFS.
A direct link to the document: wp-oraclezfsconfig-0510_ds_ac2.pdf
Talks I have given
2 weeks ago