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Virtual Box 增加虚拟内存步骤：
1.安装目录下执行 .\VBoxManage list hdds，显示UUID: 297f254e-ada0-4ddd-be61-552226c3df58
2.安装目录下执行
.\VBoxManage modifyhd 297f254e-ada0-4ddd-be61-552226c3df58 --resize 16384
3.root用户下执行#fdisk /dev/sda
[root@zendlinux ~]# fdisk /dev/sda
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):
First cylinder (1045-2088, default 1045):
Using default value 1045
Last cylinder, +cylinders or +size{K,M,G} (1045-2088, default 2088):
Using default value 2088
Command (m for help): t
Partition number (1-4):
Hex code (type L to list codes): 8e
Changed system type of partition 4 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
[root@zendlinux ~]# fdisk -l /dev/sda
Disk /dev/sda: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 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: 0x000dc501
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 1045 7875584 8e Linux LVM
/dev/sda4 1045 2088 8383252 8e Linux LVM
4.调整 LVM 大小先看看当前 Volume Group：
root@fxq:/dev/ubuntu-vg# vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 3
Act PV 3
VG Size <66.35 GiB
PE Size 4.00 MiB
Total PE 16985
Alloc PE / Size 16985 / <66.35 GiB
5.先将分配过来的新磁盘空间创建为一个新的物理卷（查看当前最新的sda编号为准）
#fdisk -l
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 4198399 4194304 2G Linux filesystem
/dev/sda3 4198400 62912511 58714112 28G Linux filesystem
/dev/sda4 62912512 83886046 20973535 10G Linux filesystem
/dev/sda5 83886080 143359966 59473887 28.4G Linux filesystem
[root@zendlinux ~]# pvcreate /dev/sda5
dev_is_mpath: failed to get device for 8:4
Physical volume "/dev/sda4" successfully created
6.后使用新的物理卷来扩展 LVM 的ubuntu-vg
[root@zendlinux ~]# vgextend ubuntu-vg /dev/sda5
Volume group "ubuntu-vg" successfully extended
7.然后扩展 LVM 的逻辑卷/dev/ubuntu-vg/ubuntu-lv
#lvextend /dev/ubuntu-vg/ubuntu-lv /dev/sda5
8.调整逻辑卷文件系统的大小
#resize2fs /dev/ubuntu-vg/ubuntu-lv
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