According to[1] kernel.org's 2.6.7 needs patching, and I saw a thread[2] about this from may. Have there been any changes since then? Will fc2 get a 2.6.8 based kernel any time soon (maybe like the one in rawhide)?
[1] To use snapshots and pvmove (mirroring) with 2.6 kernels you need the latest patches from the 2.6-unstable series. 2.6.7-udm1 contains the most up-to-date patches. Its snapshot and mirroring support has been submitted for inclusion in 2.6.8.
http://sources.redhat.com/dm/patches.html
[2] http://www.redhat.com/archives/fedora-list/2004-May/msg03831.html