Linux test5 #1 SMP Tue Oct 18 21:40:25 UTC 2011
i686 i686 i386 GNU/Linux

# /sbin/lvcreate -v -L2000M --snapshot -n snaptmp /dev/mapper/system-tmp
Setting chunksize to 16 sectors.
snapshot: Required device-mapper target(s) not detected in your kernel

After updating to SP4 I can not create LVM snapshots any more. The
systems boots normal and does set up and mount the LV correctly. Any hints?