Are there any guidelines on how mixable various versions of user level tools and the kernel LVM code are? I prefer to test-boot new kernels before comitting to them, which is a bit difficult if the user-level tools must be strictly synchronized to the kernel versions. So I am wondering how widely it is safe to wander: for example, can 0.9.1_beta8 user level tools be used safely to assemble and start up volume groups with kernel LVM 1.0 or 1.0.1rc2 code? Can the latest user-level vgscan/vgchange be used safely with the 0.9.1_beta8 kernel code? Is it the case that on-disk format changes are the important breakpoints (eg beta7 to beta8), or are there others? Is this documented anywhere? - cks
