if you do that, and you test your backup, and you are okay getting paged, waking up, following the procedure, then dealing with the half day of downtime, sure,

if you do that, and you test your backup, and you are okay getting paged, waking up, following the procedure, then dealing with the half day of downtime, sure, that's fine. but a mirror is still a whole lot easier. it just keeps chugging through the drive failure.