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@centos.org http://lists.centos.org/mailman/listinfo/centos