howto software raid under FreeBSD?

[Matthias F. Brandstetter]

---------- quoting Emanuel Strobl ----------
> You can use 'atacontrol detach' then powerdown, replace the drive and
> after booting you can 'atacontrol addspar ar0 ad6' (or what ever drive
> and array failed) and 'atacontrol rebuild ar0'.

Problem is, that man page says "atacontrol rebuild" is only valid on RAID 
capable ATA controllers. But since I have no such controller, I can't use 
this command.

How can I rebuild the array on a normal ATA controller?
Greetings, Matthias

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