是RHCE里面的内容，今天在rhel5上试过，修改了下
The Logical Volume Manager (LVM) enables you to set up one filesystem on
multiple partitions. For example, assume you’re adding more users and are running
out of room in your /home directory. You don’t have any unpartitioned space available
on your current hard disk.
With the LVM, all you need to do is add another hard disk, configure some
partitions, back up /home, and use the LVM tools to combine the new partition and
the one used by /home into a volume set. You may need to install the LVMrpm. Once it
is installed, the steps are fairly straightforward:

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