How to auto rebuild array?

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Hi,

I have the problem that after a power failure I get the message:

Jul 12 15:29:17 kernel: md: created md3
Jul 12 15:29:17 kernel: md: bind<hda4>
Jul 12 15:29:17 kernel: md: bind<hdb4>
Jul 12 15:29:17 kernel: md: bind<hde4>
Jul 12 15:29:17 kernel: md: bind<hdf4>
Jul 12 15:29:17 kernel: md: running: <hdf4><hde4><hdb4><hda4>
Jul 12 15:29:17 kernel: md: kicking non-fresh hde4 from array!
Jul 12 15:29:17 kernel: md: unbind<hde4>

I understand that hde4 is not 'fresh' and the array need to be rebuild
but I only can do that with 'mdadm --add /dev/md3 /dev/hde4'. I would
like to have it turned into a hot-spare, in which case a rebuild would
start automatic.

This application runs unattended, so there is nobody there to enter
mdadm commands.... How can I make the rebuild starting automatic
(like a hardware raidcard does)?

Regards,
	Bart
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