Does LVM impact performance?

I have to migrate a few servers to Linux, and one important aspect that I need to evaluate is that my new host system must have elastic storage capacity. Naturally, doing some basic research, I came across LVM.

Move data from regular partition to lvm

I’ve read a bit about lvm and decided that I want to switch to using it. It seems like actually setting up lvm can be done from the debian installer, so I suppose that’ll be easiest. What I’m not sure about is how to copy all of my files to the new system.