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XenSystem VPS下启用（挂载）未使用的硬盘空间
XenSystem 系统有个不好的地方，就是新开通的VPS或者重新安装系统后的VPS，硬盘空间都没有挂载，需要自己手动挂载一下。以下是完整的挂载记录
查看硬盘分区情况
fdisk -l
df -hal #查看已划分区空间使用情况
添加整个物理硬盘到lvm
pvcreate /dev/xvdb #添加整个物理硬盘xvdb到lvm
vgextend VolGroup00 /dev/xvdb #添加整个物理硬盘xvdb到LVM卷VolGroup00
vgdisplay #查看结果
#lvresize -L +20.00G /dev/VolGroup00/LogVol00 #扩展20G硬盘 这里出现错误，不需要执行
lvresize -L +19.96G /dev/VolGroup00/LogVol00 #扩展硬盘20G 略微有个差数
resize2fs /dev/VolGroup00/LogVol00 重置LVM大小
附加说明
也可以对/dev/xvdb分区再加入LVM。 我这里是直接把硬盘整个的加入LVM了。
创建分区：
fdisk /dev/xvda
n 输入n新建分区
p 输入p，主分区
3 由上图的fdisk -l可以看到硬盘已经有两个分区，我们这里输入3，第三个分区
t 通过t来指定分区系统格式
3 第3个分区（如果你就建了一个分区就不要输入3了它会自动选择的.跳过这一步）
8e 输入8e，LVM系统格式
w 输入w保存退出
reboot 重启使之生效
加入分区：
pvcreate /dev/xvda3 #创建物理卷
vgextend VolGroup00 /dev/xvda3 #将物理卷加入到组VolGroup00
完整的命令交互记录
[root@MyVPS ~]# fdisk -l
Disk /dev/xvda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 13 104391 83 Linux
/dev/xvda2 14 1044 8281507+ 8e Linux LVM
/dev/xvda3 1045 1305 2096482+ 8e Linux LVM
Disk /dev/xvdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/xvdb doesn't contain a valid partition table
[root@MyVPS ~]# df -hal
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
9.3G 1.8G 7.1G 20% /
proc 0 0 0 - /proc
sysfs 0 0 0 - /sys
devpts 0 0 0 - /dev/pts
/dev/xvda1 99M 36M 58M 39% /boot
tmpfs 513M 0 513M 0% /dev/shm
none 0 0 0 - /proc/sys/fs/binfmt_misc
sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs
[root@MyVPS ~]# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 9.84 GB
PE Size 32.00 MB
Total PE 315
Alloc PE / Size 315 / 9.84 GB
Free PE / Size 0 / 0
VG UUID ONGPxy-HBvY-xrrQ-IjEW-PIiO-2cX7-tg6tuI
[root@MyVPS ~]# pvcreate /dev/xvdb
Physical volume "/dev/xvdb" successfully created
[root@MyVPS ~]# vgextend VolGroup00 /dev/xvdb
Volume group "VolGroup00" successfully extended
[root@MyVPS ~]# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 3
Act PV 3
VG Size 29.81 GB
PE Size 32.00 MB
Total PE 954
Alloc PE / Size 315 / 9.84 GB
Free PE / Size 639 / 19.97 GB
VG UUID ONGPxy-HBvY-xrrQ-IjEW-PIiO-2cX7-tg6tuI
[root@MyVPS ~]# lvresize -L +20.00G /dev/VolGroup00/LogVol00
Extending logical volume LogVol00 to 29.59 GB
Insufficient free space: 640 extents needed, but only 639 available
[root@MyVPS ~]# lvresize -L +19.96G /dev/VolGroup00/LogVol00
Rounding up size to full physical extent 19.97 GB
Extending logical volume LogVol00 to 29.56 GB
Logical volume LogVol00 successfully resized
[root@MyVPS ~]# resize2fs /dev/VolGroup00/LogVol00
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required
Performing an on-line resize of /dev/VolGroup00/LogVol00 to 7749632 (4k) blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 7749632 blocks long.
