Lvcreate 불가

ubuntu 8.04 32bit desktop version 설치 후 memory 가 32Gb 라서 64 bit Kernel 을 올렸습니다.
외장 disk 인식을 하려고 하는데요…pv 및 vg 생성은 되는데…lvcreate 하면 에러가 발생합니다…ㅠㅠ
/proc/misc: No entry 라는 에러가 발생하는데요…이거 어떻게 조치를 해야 하나요?

vgs

VG #PV #LV #SN Attr VSize VFree
testvg 2 0 0 wz–n- 399.99G 399.99G

lvcreate -L120G -n testlv testvg

/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
Incompatible libdevmapper 1.02.20 (2007-06-15)(compat) and kernel driver
striped: Required device-mapper target(s) not detected in your kernel
lvcreate: Create a logical volume
lvcreate
[-A|–autobackup {y|n}]
[–addtag Tag]
[–alloc AllocationPol

cat /proc/misc

63 tgt
229 fuse
1 psaux
228 hpet
135 rtc
231 snapshot

load dm_mod first.

[code:2lkgww07]
$ sudo modprobe dm_mod
[/code:2lkgww07]