Hi,
i have a problem with my hp server. I have installed OpenSuSE 10.3 with RAID 1 configuration (2 s-ata disks, 4 raid volume (md0 -> /boot, md1 -> swap, md2 ->/home, md3 -> /).
All work fine but now i need to test the my raid configuration.
In order to do a simulation of fault i have do this:
mdadm /dev/mdX --fail /dev/sdY --remove /dev/sdY
for all 4 raid volume.
Next i have shutdown the system and physically replaced one disk with an empty one.
Restart the system and do this
sfdisk -d /dev/sda | sfdisk /dev/sdb
mdadm /dev/mdX --add /dev/sdY
for all 4 raid volume.

When all raid volume are rebuilt i have do
cat /proc/mdstat to verify the situation and all 4 volume results UU.

I have also reinstalled grub on new disk, but whed i have tried to reboot the system with only the 2nd disk grub show me Error 15.

i have do an
mdadm --examine /dev/sdb1
mdadm --examine /dev/sda1
mdadm --examine /dev/sdb2
mdadm --examine /dev/sda2
...
...


and the output show (between the other lines)
State: clean
Array Slot: 2 (0, failed, 1)
Array State: uU 1 failed.

what's wrong ?
thank's to all