Fong - ZFS Rollback

Followup on your ZFS tutorial... http://www.bsdnow.tv/tutorials/zfs

On a system where you have ZFS-on-root, I'm still a bit shaky on what happens when you do a rollback of the entire filesystem.

For instance, I upgraded pkgs and it broke a bunch of stuff. So I first attempted rollback with:

zfs rollback -rv zroot@<snapshot-name>

...but it seemed to do nothing. I stumbled upon this syntax that seemed to work:

zfs rollback -rv zroot/ROOT/default@<snapshot-name>

I'm not clear on what /ROOT/default refers to and why it's necessary?


Lastly, the software I was effectively trying to restore didn't seem copasetic until I rebooted. Wondering if you could give me a sanity check on this?

Is this a give-in? Or could I have potentially have stopped/started the right combination of services and gotten the same results live in-place?


TIA

Fong