LVM version 2, or LVM2, is the default for Red Hat Enterprise
Linux, which uses the device mapper driver contained in the 2.6
kernel. LVM2, which is almost completely compatible with the
earlier LVM1 version, can be upgraded from versions of Red Hat
Enterprise Linux running the 2.4 kernel.
Although upgrading from LVM1 to LVM2 is usually seamless, refer
to Section 7.3
Additional Resources for further details on more complex
requirements and upgrading scenarios.
