problems getting RAID1 to work with SiI 0680 UDMA133 controller

[Lasse Edlund]

I have this "ultra ata IDE controller card" that I try to use with RAID1,

Both the harddrives I intend to use, ad6 & ad4 are working, fsck gives no
errors and I can read/write on them.

I have setup raid1 on these in the bios utility for the ata controller card.
but now It says one of them is down!

Why is that? And what can I do about it?

 

>From dmesg:

atapci0: <SiI 0680 UDMA133 controller> port
0x1050-0x1057,0x1060-0x1063,0x1058-0
x105f,0x1064-0x1067,0x1040-0x104f mem 0x40100000-0x401000ff irq 18 at device
9.0         on pci2

ad0: 19092MB <Seagate ST320414A 3.25> at ata0-master UDMA100

acd0: CDROM <Compaq CRD-8484B/1.04> at ata1-master PIO4

ad4: 190782MB <WDC WD2000JB-00GVA0 08.02D08> at ata2-master UDMA100

ad5: 286188MB <Maxtor 6L300R0 BAJ41G20> at ata2-slave UDMA133

ad6: 190782MB <WDC WD2000JB-00EVA0 15.05R15> at ata3-master UDMA100

ad7: 14664MB <IBM DJNA-351520 J56OA30K> at ata3-slave UDMA66

ar0: WARNING - mirror protection lost. RAID1 array in DEGRADED mode

ar0: 190781MB <Silicon Image Medley RAID1> status: DEGRADED

ar0: disk0 DOWN no device found for this subdisk

ar0: disk1 READY (mirror) using ad6 at ata3-master

 

su-2.05b# atacontrol list

ATA channel 0:

    Master:  ad0 <ST320414A/3.25> ATA/ATAPI revision 4

    Slave:       no device present

ATA channel 1:

    Master: acd0 <Compaq CRD-8484B/1.04> ATA/ATAPI revision 0

    Slave:       no device present

ATA channel 2:

    Master:  ad4 <WDC WD2000JB-00GVA0/08.02D08> ATA/ATAPI revision 6

    Slave:   ad5 <Maxtor 6L300R0/BAJ41G20> ATA/ATAPI revision 7

ATA channel 3:

    Master:  ad6 <WDC WD2000JB-00EVA0/15.05R15> ATA/ATAPI revision 6

    Slave:   ad7 <IBM-DJNA-351520/J56OA30K> ATA/ATAPI revision 4