Mailing the story:
Manual LVM disk partitioning guide for Fedora 17
That is because with Anaconda’s LVM-based disk partitioning scheme, all available disk space are allocated to the LVM Physical Volume, which makes it impossible to recover space from the system for installing another distribution. That is why it is very important to plan for the future, when installing Fedora. In this article, a step-by-step guide on how to create an LVM-based disk partitioning scheme for Fedora 17.