I thought the UUID stuff was a red herring. Here's the output from
2.6.20-12, where everything works ok:

$ sudo dmraid -ay -vvvv -dddd
WARN: locking /var/lock/dmraid/.lock
NOTICE: /dev/sda: asr     discovering
NOTICE: /dev/sda: ddf1    discovering
NOTICE: /dev/sda: hpt37x  discovering
NOTICE: /dev/sda: hpt45x  discovering
NOTICE: /dev/sda: isw     discovering
NOTICE: /dev/sda: jmicron discovering
NOTICE: /dev/sda: lsi     discovering
NOTICE: /dev/sda: nvidia  discovering
NOTICE: /dev/sda: nvidia metadata discovered
NOTICE: /dev/sda: pdc     discovering
NOTICE: /dev/sda: sil     discovering
NOTICE: /dev/sda: via     discovering
NOTICE: /dev/sdb: asr     discovering
NOTICE: /dev/sdb: ddf1    discovering
NOTICE: /dev/sdb: hpt37x  discovering
NOTICE: /dev/sdb: hpt45x  discovering
NOTICE: /dev/sdb: isw     discovering
NOTICE: /dev/sdb: jmicron discovering
NOTICE: /dev/sdb: lsi     discovering
NOTICE: /dev/sdb: nvidia  discovering
NOTICE: /dev/sdb: nvidia metadata discovered
NOTICE: /dev/sdb: pdc     discovering
NOTICE: /dev/sdb: sil     discovering
NOTICE: /dev/sdb: via     discovering
NOTICE: /dev/sdc: asr     discovering
NOTICE: /dev/sdc: ddf1    discovering
NOTICE: /dev/sdc: hpt37x  discovering
NOTICE: /dev/sdc: hpt45x  discovering
NOTICE: /dev/sdc: isw     discovering
NOTICE: /dev/sdc: jmicron discovering
NOTICE: /dev/sdc: lsi     discovering
NOTICE: /dev/sdc: nvidia  discovering
NOTICE: /dev/sdc: pdc     discovering
NOTICE: /dev/sdc: sil     discovering
NOTICE: /dev/sdc: via     discovering
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: not found nvidia_acihdbbb
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: not found nvidia_acihdbbb
NOTICE: added /dev/sda to RAID set "nvidia_acihdbbb"
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: found nvidia_acihdbbb
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: found nvidia_acihdbbb
NOTICE: added /dev/sdb to RAID set "nvidia_acihdbbb"
DEBUG: checking nvidia device "/dev/sda"
DEBUG: checking nvidia device "/dev/sdb"
DEBUG: set status of set "nvidia_acihdbbb" to 16
INFO: Activating mirror RAID set "nvidia_acihdbbb"
NOTICE: discovering partitions on "nvidia_acihdbbb"
NOTICE: /dev/mapper/nvidia_acihdbbb: dos     discovering
NOTICE: /dev/mapper/nvidia_acihdbbb: dos metadata discovered
DEBUG: _find_set: searching nvidia_acihdbbb1
DEBUG: _find_set: not found nvidia_acihdbbb1
DEBUG: _find_set: searching nvidia_acihdbbb2
DEBUG: _find_set: not found nvidia_acihdbbb2
DEBUG: _find_set: searching nvidia_acihdbbb3
DEBUG: _find_set: not found nvidia_acihdbbb3
NOTICE: created partitioned RAID set(s) for /dev/mapper/nvidia_acihdbbb
INFO: Activating partition RAID set "nvidia_acihdbbb1"
INFO: Activating partition RAID set "nvidia_acihdbbb2"
INFO: Activating partition RAID set "nvidia_acihdbbb3"
WARN: unlocking /var/lock/dmraid/.lock
DEBUG: freeing devices of RAID set "nvidia_acihdbbb"
DEBUG: freeing device "nvidia_acihdbbb", path "/dev/sda"
DEBUG: freeing device "nvidia_acihdbbb", path "/dev/sdb"
DEBUG: freeing devices of RAID set "nvidia_acihdbbb1"
DEBUG: freeing device "nvidia_acihdbbb1", path "/dev/mapper/nvidia_acihdbbb"
DEBUG: freeing devices of RAID set "nvidia_acihdbbb2"
DEBUG: freeing device "nvidia_acihdbbb2", path "/dev/mapper/nvidia_acihdbbb"
DEBUG: freeing devices of RAID set "nvidia_acihdbbb3"
DEBUG: freeing device "nvidia_acihdbbb3", path "/dev/mapper/nvidia_acihdbbb"

$ ls -l /dev/mapper/
total 0
crw-rw---- 1 root root  10, 63 2008-05-01 17:57 control
brw-rw---- 1 root disk 253,  0 2008-05-01 22:50 nvidia_acihdbbb
brw-rw---- 1 root disk 253,  1 2008-05-01 22:50 nvidia_acihdbbb1
brw-rw---- 1 root disk 253,  2 2008-05-01 22:50 nvidia_acihdbbb2
brw-rw---- 1 root disk 253,  3 2008-05-01 22:50 nvidia_acihdbbb3

(no errors from dmesg)

and from 2.6.24-16:

$ sudo dmraid -ay -dddd -vvvv
WARN: locking /var/lock/dmraid/.lock
NOTICE: /dev/sdc: asr     discovering
NOTICE: /dev/sdc: ddf1    discovering
NOTICE: /dev/sdc: hpt37x  discovering
NOTICE: /dev/sdc: hpt45x  discovering
NOTICE: /dev/sdc: isw     discovering
NOTICE: /dev/sdc: jmicron discovering
NOTICE: /dev/sdc: lsi     discovering
NOTICE: /dev/sdc: nvidia  discovering
NOTICE: /dev/sdc: pdc     discovering
NOTICE: /dev/sdc: sil     discovering
NOTICE: /dev/sdc: via     discovering
NOTICE: /dev/sdb: asr     discovering
NOTICE: /dev/sdb: ddf1    discovering
NOTICE: /dev/sdb: hpt37x  discovering
NOTICE: /dev/sdb: hpt45x  discovering
NOTICE: /dev/sdb: isw     discovering
NOTICE: /dev/sdb: jmicron discovering
NOTICE: /dev/sdb: lsi     discovering
NOTICE: /dev/sdb: nvidia  discovering
NOTICE: /dev/sdb: nvidia metadata discovered
NOTICE: /dev/sdb: pdc     discovering
NOTICE: /dev/sdb: sil     discovering
NOTICE: /dev/sdb: via     discovering
NOTICE: /dev/sda: asr     discovering
NOTICE: /dev/sda: ddf1    discovering
NOTICE: /dev/sda: hpt37x  discovering
NOTICE: /dev/sda: hpt45x  discovering
NOTICE: /dev/sda: isw     discovering
NOTICE: /dev/sda: jmicron discovering
NOTICE: /dev/sda: lsi     discovering
NOTICE: /dev/sda: nvidia  discovering
NOTICE: /dev/sda: nvidia metadata discovered
NOTICE: /dev/sda: pdc     discovering
NOTICE: /dev/sda: sil     discovering
NOTICE: /dev/sda: via     discovering
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: not found nvidia_acihdbbb
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: not found nvidia_acihdbbb
NOTICE: added /dev/sdb to RAID set "nvidia_acihdbbb"
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: found nvidia_acihdbbb
DEBUG: _find_set: searching nvidia_acihdbbb
DEBUG: _find_set: found nvidia_acihdbbb
NOTICE: added /dev/sda to RAID set "nvidia_acihdbbb"
DEBUG: checking nvidia device "/dev/sda"
DEBUG: checking nvidia device "/dev/sdb"
DEBUG: set status of set "nvidia_acihdbbb" to 16
WARN: unlocking /var/lock/dmraid/.lock
DEBUG: freeing devices of RAID set "nvidia_acihdbbb"
DEBUG: freeing device "nvidia_acihdbbb", path "/dev/sda"
DEBUG: freeing device "nvidia_acihdbbb", path "/dev/sdb"

dmesg:

[  322.015422] device-mapper: table: 253:0: mirror: Device lookup failure
[  322.015428] device-mapper: ioctl: error adding target to table

$ ls -l /dev/mapper
total 0
crw-rw---- 1 root root 10, 63 2008-05-01 22:58 control

-- 
dmraid not correctly detecting nforce raid
https://bugs.launchpad.net/bugs/136804
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