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 Kjellstr?m 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?
>
>
>
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