Well thank you Peter. Thas was indeed the solution. A simple 'modprobe dm-snapshot' and now I can create snapshots. This falls into the category of 'LVM1 to LVM2 Transition Gotcha'. Do you have any other 'gotchas' to share? I wonder why these modules aren't loaded when either an LVM device is detected or a command requiring them is run? Kirk Bocek Peter Kjellström wrote: > On Saturday 30 July 2005 17.01, Kirk Bocek wrote: > >>Just discovered that on CentOS 4.1 when you issue the command: >> >> lvcreate -s -n temp -L2G /dev/vgname/lvname >> >>to create a snapshot, you get the error message: >> >> snapshot: Required device-mapper target(s) not detected in your kernel > > > I think you need to do: > > modprobe dm-snapshot > > but I haven't tested it myself but almost the same thing happened to me when I > tried to move a lv around (it then needs dm-mirror..) > > good luck, > Peter > > >>I've checked and recheck my spelling and tried using the device created >>under /dev/mapper. I've tried it on both x86_64 and on i386. Works as >>expected under CentOS 3.5. >> >>Any ideas what is going on? > > > > ------------------------------------------------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos