I agree with Adam... An edge case or test case for a d.r site though... we have a customer who wants to do this for D.R. testing without shutting down the source system... the D.R. site is behind a firewall and secured so no split brain issue... the options we came up with.. but Adam's point is the first thing to think of...no split brain and design the testing carefully..
1. vfiler dr allows you to have a different IP, nis and dns at the dr site... so setup the d.r. site with the different ips... the only issue here is if you really need the same ips on failover... then you have use "vfiler run vfilername setup -e"...for the interface change to the test addresses, then change back to the actual failover addresses. The only little issue there is that setup wacks the exports, hosts.equiv, and other files...but the /etc mirror will fix that... except the different ip, nis, dns which is updated with vfiler dr activate.
2. create flexclones of each vfiler volume, then manually create the vfiler using all the clone volumes... not too hard to do and source mirrors keep working..even though more typing...create the test vfiler with a different ip.