I don't get why you need to do so. RAID is not a substitute of backups, and shouldn't used that way. Meaning that of course you have a backup of the data that you can recover from.

RAID is used for two things:

1. improving the performance of slow disks (at least the read performance) 2. having 1/2 disk fail with your system remaining completely usable, till you replace the faulty disk as soon as possible.

The second point is fundamental to me: there shouldn't be any disruption of service whatsoever, meaning that only the sysadmin should notice the fault (beside maybe a reduced performance of the system since you have 1 less drive). Database transaction that were in progress when the disk did break shouldn't fail, writes/reads on the FS shouldn't fail, the only thing that should happen is an alarm triggered in the monitoring system to inform that a disk needs to be changed as soon as possible.

Having a RAID with manual recovery... it means that you could end up a Saturday evening in front of a computer to bring a system back online, and still some data corruption may have happened.