Re: lvm and snapshot?

[Dave Alden <alden math ohio-state edu>]

Hi,

On Mon, Mar 21, 2005 at 03:28:40PM +0000, Stephen Gardner wrote:
> On Mon, 21 Mar 2005, Dave Alden wrote:
> 
> ># lvm lvcreate -L 500M -s -n snap-data /dev/vg0/lv0
> > snapshot: Required device-mapper target(s) not detected in your kernel
> > lvcreate: Create a logical volume
> 
> Dave,
> 	Someone with more experience of LVM2 may know. It's worth running
> lsmod |grep dm_
> 
> To see which device-mapper modules are loaded. Look for dm_snapshot and if 
> it's not there try  modprobe dm_snapshot   before running the lvm 
> lvcreate. This should be loading automatically. It might be worth 
> waiting for an alternative answer as creating snapshots without the 
> modules autoloading might leave the machine in an unusable state.

Many thanks -- a "modprobe dm-snapshot" took care of it.  I've also set it
to start at boot time.

...thnx,
...dave