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sda and sdb block specials point to same device and get mixed up which leads to strange behaviors(hardware RAID doesn't work after new installation of 12.04)

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UPDATE
by the way, the Ubuntu installer shows the RAID array and not the partitions. See also https://bugs.launchpad.net/ubuntu/+bug/973147

UPDATE
by the way, the Ubuntu installer shows the RAID array and not the partitions. See also https://bugs.launchpad.net/ubuntu/+bug/973147

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sda and sdb block specials point to same device and get mixed up which leads to strange behaviors

I just installed the latest Ubuntu 12.04 and obviously it screws something up. I'm not sure if this has anything to do with the fact that I have a Raid 1 but at the moment, I have sda and sdb which point to the same device:

# blkid
/dev/sda1: UUID="88aa922a-4304-406e-8abd-edc2e9064d79" TYPE="ext2" 
/dev/sda2: UUID="22b881d5-6f5c-484d-94e8-e231896fa91b" TYPE="swap" 
/dev/sda3: UUID="e1fa161b-b014-4a6b-831a-9d8f9e04be07" TYPE="ext3" 
/dev/sda5: UUID="6ed19886-1cba-47b2-9ce0-7c2ea8f9c3c9" SEC_TYPE="ext2" TYPE="ext3" 
/dev/sdb1: UUID="88aa922a-4304-406e-8abd-edc2e9064d79" TYPE="ext2" 
/dev/sdb2: UUID="22b881d5-6f5c-484d-94e8-e231896fa91b" TYPE="swap" 
/dev/sdb3: UUID="e1fa161b-b014-4a6b-831a-9d8f9e04be07" SEC_TYPE="ext2" TYPE="ext3" 
/dev/sdb5: UUID="6ed19886-1cba-47b2-9ce0-7c2ea8f9c3c9" TYPE="ext3"

But I have only one "visible" hard disc, so this ought to be sda. In my earlier version (10.10) /dev/mapper took care of it. Look at the mount points below. In the current version, this doesn't work anymore, so I entered sda mount points to fstab at first, which seemed to work, but when I execute the mount command, I saw that suddendly one partition was mounted as sdb instead of sda. So I tried to use the UUID as file system in fstab but the problem still exists. Which is even worse: It mixes up both devices. That means it sometimes mount one partition as sda, at next reboot it is suddendly sdb. And it behaves as it would mount different hard drives, because my /home partition was mounted once as sda, now as sdb and changes and setting I made in file system were suddenly "reset". What can I do? Should I delete all sdb block specials?

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
#/dev/mapper/pdc_ccfhbjbeeg3 /               ext3    errors=remount-ro 0       1
#/dev/mapper/pdc_ccfhbjbeeg1 /boot           ext2    defaults        0       2
#/dev/mapper/pdc_ccfhbjbeeg5 /home           ext3    defaults        0       2
#/dev/mapper/pdc_ccfhbjbeeg2 none            swap    sw              0       0
#/dev/sda1                   /boot           ext2    defaults        0       2
#/dev/sda2                   none            swap    sw              0       0
#/dev/sda3                   /               ext3    errors=remount-ro 0     1
#/dev/sda5                   /home           ext3    defaults        0       2

UUID=e1fa161b-b014-4a6b-831a-9d8f9e04be07      /               ext3    errors=remount-ro 0     1
UUID=88aa922a-4304-406e-8abd-edc2e9064d79       /boot           ext2    defaults        0       2
UUID=6ed19886-1cba-47b2-9ce0-7c2ea8f9c3c9      /home           ext3    defaults        0       2
UUID=22b881d5-6f5c-484d-94e8-e231896fa91b       none            swap    sw     0       0