Intel Matrix RAID (ICH8R) rebuild?

[Krassimir Slavchev]

Hello,

I have problems rebuilding RAID1 array. The bios shows status 'Rebuild' 
and 'Volumes with "Rebuild" status will be rebuilt within the operating 
system'.
When I try to do 'atacontrol rebuild ar0':
atacontrol: ioctl(IOCATARAIDREBUILD): Device not configured

I run 6.2-STABLE:

dmesg:
...
atapci1: <Intel ICH8 SATA300 controller> port 
0xec00-0xec07,0xe880-0xe883,0xe800-0xe807,0xe480-0xe483,0xe400-0xe41f 
mem 0xfebff800-0xfebfffff irq 19 at device 31.2 on pci0
atapci1: AHCI Version 01.10 controller with 6 ports detected
ata5: <ATA channel 0> on atapci1
ata6: <ATA channel 1> on atapci1
ata7: <ATA channel 2> on atapci1
ata8: <ATA channel 3> on atapci1
ata9: <ATA channel 4> on atapci1
ata10: <ATA channel 5> on atapci1
...
ad10: 152627MB <Seagate ST3160811AS 3.AAE> at ata5-master SATA300
ad12: 152627MB <Seagate ST3160811AS 3.AAE> at ata6-master SATA300
ar0: 152625MB <Intel MatrixRAID RAID1> status: READY
ar0: disk0 READY (master) using ad10 at ata5-master
ar0: disk1 READY (mirror) using ad12 at ata6-master

pciconf -lv:
atapci1 at pci0:31:2:    class=0x010400 card=0x81ec1043 chip=0x28228086 
rev=0x02 hdr=0x00
    vendor     = 'Intel Corporation'
    class      = mass storage
    subclass   = RAID

atacontrol status ar0:
ar0: ATA RAID1 subdisks: ad10 ad12 status: READY

The motherboard is Asus P5-E.


How to rebuild my RAID?

Thanks in advance