扩展oracle VM VirtualBox硬盘容量
1.首先对于box的扩展，只支持VDI VHD两种格式
DOC下，访问到vbox安装目录下：
//VirtualBox 的安装目录
cd D:\Oracle\VirtualBox
d:
如果硬盘是vmdk格式，首先需要克隆并转格式，命令如下：
VDI:
VBoxManage clonehd "C:\Users\pactera\VirtualBox VMs\centos\centos.vmdk" "C:\Users\pactera\VirtualBox VMs\centos\centos.vdi" --format VDI
VHD:
VBoxManage clonehd "C:\Users\pactera\VirtualBox VMs\centos\centos.vmdk" "C:\Users\pactera\VirtualBox VMs\centos\centos.vhd" --format VHD
其他实用命令：
删除
VBoxManage closemedium disk “D:\tool\Oracle\VirtualBox VMs\centos7-03\centos7-03.vmdk” --delete
浏览
D:\Oracle\VirtualBox>VBoxManage.exe list hdds
2、修改硬盘大小
示例为：15G即25600M
VBoxManage modifyhd "C:\Users\pactera\VirtualBox VMs\centos\centos.vhd" --resize 25600
3、用新增的空间新建分区
[root@localhost ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): nPartition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p
Selected partition 4
No free sectors available
Command (m for help): xfs_growfs /dev/mapper/centos-root
enter后输入w再enter
4、用以下命令可以看到 多了一个/dev/sda3的分区
[root@localhost ~]# fdisk -l
Disk /dev/sda: 26.8 GB, 26843545600 bytes, 52428800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000d51e5
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 20971519 9436160 8e Linux LVM
/dev/sda3 20971520 52428799 15728640 83 Linux
Disk /dev/mapper/centos-root: 24.7 GB, 24687673344 bytes, 48218112 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 1073 MB, 1073741824 bytes, 2097152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
c . reboot 重启，然后格式化/dev/sda3
mkfs.ext3 /dev/sda3
5、创建物理卷
[root@localhost ~]# pvcreate /dev/sda3
Physical volume “/dev/sda3” successfully created
使用新增物理卷扩展vg
[root@localhost ~]# vgextend centos /dev/sda3
Volume group “centos” successfully extended
[root@localhost ~]#xfs_growfs /dev/mapper/centos-root
6、lvresize -l +100%FREE /dev/mapper/centos-root
Size of logical volume centos/root changed from <8.00 GiB (2047 extents) to 22.99 GiB (5886 extents).
Logical volume centos/root successfully resized.
7、最后扩展在线扩展文件系统：
[root@localhost ~]#xfs_growfs /dev/mapper/centos-root
说明： 很多资料是说这个: resize2fs -f /dev/mapper/centos-root
但是报错，因为centOS默认文件系统是xfs的只能用，NND坑了我好久（直到看到别人的http://blog.itpub.net/24486203/viewspace-1790666）才知道要用这个:xfs_growfs
/dev/mapper/centos-root
[root@localhost ~]#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 23G 3.6G 20G 16% /
devtmpfs 486M 0 486M 0% /dev
tmpfs 497M 0 497M 0% /dev/shm
tmpfs 497M 6.7M 490M 2% /run
tmpfs 497M 0 497M 0% /sys/fs/cgroup
/dev/sda1 1014M 125M 890M 13% /boot
tmpfs 100M 0 100M 0% /run/user/0
/dev/sda3 20971520 52428799 15728640 83 Linux
报错：
1>操作过程如果有报错：
WARNING: Re-reading the partition table failed with error 22:
执行：
[root@localhost ~]#/sbin/kpartx -a /dev/sda3
后继续操作
参考文章：
主：http://blog.csdn.net/laiyangwen1120/article/details/51036404
其他：
http://blog.163.com/zhu329599788@126/blog/static/66693350201731521131776/
http://blog.csdn.net/weiguang1017/article/details/52252448
https://zhidao.baidu.com/question/468894513.html