首先分区：
# fdisk /dev/sda
The number of cylinders for this disk is set to 60801.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help):p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 12748 102398278+ 83 Linux
/dev/sda2 12749 13270 4192965 82 Linux swap / Solaris
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (13271-60801, default 13271):
Using default value 13271
Last cylinder or +size or +sizeM or +sizeK (13271-60801, default 60801):
Using default value 60801
Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
执行下面的命令不必重启机器：
# partprobe 这个命令必须记住，老是忘记
创建物理卷：
# pvcreate /dev/sda3
创建卷组：
# vgcreate xenvg /dev/sda3
创建逻辑卷：
# lvcreate -L 10G -n test xenvg
