You can always set copies=2 to work around block-level failures on important datasets. Beyond that, you still get all the other ZFS goodness for management, sn

You can always set copies=2 to work around block-level failures on important datasets. Beyond that, you still get all the other ZFS goodness for management, snapshots, compression, zvols, error detection, send/recv, and so forth. Best of all, you can always throw another disk at it and convert to a mirror if the situation changes.