Catching up on my reading, this item caught my eye:[Phoronix] Fedora 13 May Support Btrfs System Rollbacks
Nice to see Fedora planning to add features we in OpenSolaris take for granted! I'd certainly be more inclined to use Fedora for the occasional times I need Linux if this came in, as I've suffered in the past from RPM disasters. It does look like they've got some design work to do yet on the file system organization, as for rollbacks like this it's critical to ensure that system software state, operational data such as logs and audit trails, and user state are separated. Though this is something we haven't yet completed satisfactorily in OpenSolaris, either. We mostly do well on user state since home directories are outside the boot environment section of a root pool, but separating the invariant parts of /var (logs, mail queues) out from the variant parts is a problem we still need to resolve.