sparse copy i.e. /dev/sda3 -> /dev/mvlvm/mythinpool?

Hi list,

is it possible, to copy a real device like /dev/sda3 to a thinpool device in a sparse way? I tried several things like dd_rescue -a .. , but there was no sparse-effect :-(

Any hints?

Tfh!

Oliver

I no longer have it however I wrote a program to resparse files a long time ago. what it did was read a block of data, if it was zero it did nothing, if it had data it seeked to the beginning of where the data is and then wrote it, and when it got to the end it seeked to the end.

James