参考：http://blog.csdn.net/naruto2011sasuke/article/details/50459117
需求，本来服务器挂载在home下面只有200G 现在将其扩充到500G 以满足业务需求，
首先将在将服务器的磁盘 扩充到500G 然后再到服务端操作：
具体操作
1. 初始状态
[
root@localhost ~]# fdisk -l
Disk /dev/xvda: 536.9 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005b130
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/xvda2 64 39163 314059776 8e Linux LVM
Disk /dev/mapper/VolGroup-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes可以看到新加的磁盘空间已经可以看到，我们将其多的空间全部挂载到home下面去
2. 分区
将其多余的空间划分到xvda3
[root@localhost ~]# fdisk /dev/xvda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (39163-65270, default 39163):
Using default value 39163
Last cylinder, +cylinders or +size{K,M,G} (39163-65270, default 65270):
Using default value 65270
Command (m for help): p
Disk /dev/xvda: 536.9 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005b130
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/xvda2 64 39163 314059776 8e Linux LVM
/dev/xvda3 39163 65270 209708475 83 Linux
Command (m for help): w
The partition table has been altered!此时 可以看到分区已经分好了：
[root@localhost ~]# fdisk -l
Disk /dev/xvda: 536.9 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005b130
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/xvda2 64 39163 314059776 8e Linux LVM
/dev/xvda3 39163 65270 209708475 83 Linux3. PV阶段
现在的xvda3还不是lvm, 所以执行pvcreate /dev/xvda3
查看xvda3使用情况：
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/xvda2 VolGroup lvm2 a--u 299.51g 0
/dev/xvda3 lvm2 ---- 199.99g 199.99g查看主分区磁盘
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 299.51 GiB
PE Size 4.00 MiB
Total PE 76674
Alloc PE / Size 76674 / 299.51 GiB
Free PE / Size 0 / 0
VG UUID rSmKgF-EtfI-1ceP-DdJT-ggP3-xVtO-gDOs72扩容 该磁盘：
[root@localhost ~]# vgextend VolGroup /dev/xvda3 提示成功：Volume group "VolGroup" successfully extended
5. resize阶段
查看具体挂着点使用情况：
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/VolGroup/lv_root
LV Name lv_root
VG Name VolGroup
LV UUID 56pQv3-mzU8-DM0t-4jRJ-0vBb-ys30-ArIGvV
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2018-01-21 23:25:19 +0800
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/VolGroup/lv_home
LV Name lv_home我们需要的是扩容 home 这个挂载点
输入扩容命令：
[root@localhost ~]# lvextend -l +100%FREE /dev/VolGroup/lv_home
[root@localhost ~]# resize2fs -p -F /dev/VolGroup/lv_home稍等片刻 df -h 查看：
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
50G 687M 46G 2% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/xvda1 477M 28M 425M 7% /boot
/dev/mapper/VolGroup-lv_home
439G 71M 417G 1% /home
[root@localhost ~]#扩容成功！
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