> Then there is a failure, such that D1 becomes disconnected. ZFS
> continues to write on D0. If D1 were to become reconnected, it would
> get resilvered normally and all would be well.
>
> But suppose instead there is a crash, and when the system reboots it is
> connected only to D1, and D0
Consider the following scenario involving various failures.
We have a zpool composed of a simple mirror of two devices D0 and D1
(these may be local disks, slices, LUNs on a SAN, or whatever). For the
sake of this scenario, it's probably most intuitive to think of them as
LUNs on a SAN. Init
