VirtualBox磁盘扩容

参考：http://www.awaimai.com/1194.html

http://blog.youkuaiyun.com/onlysingleboy/article/details/38562283

https://www.linuxdashen.com/%E5%A6%82%E4%BD%95%E4%B8%BAvirtualbox%E8%99%9A%E6%8B%9F%E7%A1%AC%E7%9B%98%E6%89%A9%E5%AE%B9

[root@rhel65x64 ~]# fdisk -l

Disk /dev/sda: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 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: 0x00077691


   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        2089    16264192   8e  Linux LVM


Disk /dev/mapper/vg_rhel65x64-lv_root: 14.9 GB, 14935916544 bytes
255 heads, 63 sectors/track, 1815 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: 0x00000000




Disk /dev/mapper/vg_rhel65x64-lv_swap: 1715 MB, 1715470336 bytes
255 heads, 63 sectors/track, 208 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: 0x00000000

[root@rhel65x64 ~]# 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): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   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): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (2089-4177, default 2089): 
Using default value 2089
Last cylinder, +cylinders or +size{K,M,G} (2089-4177, default 4177): 
Using default value 4177


Command (m for help): w
The partition table has been altered!


Calling ioctl() to re-read partition table.


WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

[root@rhel65x64 ~]# reboot


Broadcast message from root@rhel65x64
(/dev/pts/1) at 3:33 ...


The system is going down for reboot NOW!
[root@rhel65x64 ~]# 
Connection closed by foreign host.


Disconnected from remote host(RHEL65x64) at 11:33:24.


Type `help' to learn how to use Xshell prompt.
[c:\~]$ 


Connecting to 192.168.56.101:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.


Last login: Tue Oct  4 03:15:52 2016 from 192.168.56.1
[root@rhel65x64 ~]# mkfs.ext4 /dev/sda3
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1048576 inodes, 4193634 blocks
209681 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=4294967296
128 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
4096000


正在写入inode表: 完成                            
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成


This filesystem will be automatically checked every 28 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@rhel65x64 ~]# vgdisplay
  --- Volume group ---
  VG Name               vg_rhel65x64
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               15.51 GiB
  PE Size               4.00 MiB
  Total PE              3970
  Alloc PE / Size       3970 / 15.51 GiB
  Free  PE / Size       0 / 0   
  VG UUID               SeAvmH-PExI-FoYt-dhOP-ebbH-7WwF-FAoL0E
   
[root@rhel65x64 ~]# pvcreate /dev/sda3
  Physical volume "/dev/sda3" successfully created
[root@rhel65x64 ~]# vgextend vg_rhel65x64 /dev/sda3
  Volume group "vg_rhel65x64" successfully extended
[root@rhel65x64 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_rhel65x64/lv_root
  LV Name                lv_root
  VG Name                vg_rhel65x64
  LV UUID                2VCzVX-gy9R-EJpW-3qQG-YaT9-vKs4-Uz1ncY
  LV Write Access        read/write
  LV Creation host, time rhel65x64, 2016-04-17 15:10:03 +0800
  LV Status              available
  # open                 1
  LV Size                13.91 GiB
  Current LE             3561
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/vg_rhel65x64/lv_swap
  LV Name                lv_swap
  VG Name                vg_rhel65x64
  LV UUID                kuugDy-qmsW-ZTy2-3KOd-XHGc-r7zX-dT8Mpm
  LV Write Access        read/write
  LV Creation host, time rhel65x64, 2016-04-17 15:10:05 +0800
  LV Status              available
  # open                 1
  LV Size                1.60 GiB
  Current LE             409
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
[root@rhel65x64 ~]# lvextend /dev/vg_rhel65x64/lv_root /dev/sda3
  Extending logical volume lv_root to 29.91 GiB
  Logical volume lv_root successfully resized
[root@rhel65x64 ~]# df -h
Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/vg_rhel65x64-lv_root   14G  2.6G   11G  20% /
tmpfs                             2.0G   76K  2.0G   1% /dev/shm
/dev/sda1                         485M   39M  421M   9% /boot
[root@rhel65x64 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_rhel65x64/lv_root
  LV Name                lv_root
  VG Name                vg_rhel65x64
  LV UUID                2VCzVX-gy9R-EJpW-3qQG-YaT9-vKs4-Uz1ncY
  LV Write Access        read/write
  LV Creation host, time rhel65x64, 2016-04-17 15:10:03 +0800
  LV Status              available
  # open                 1
  LV Size                29.91 GiB
  Current LE             7656
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/vg_rhel65x64/lv_swap
  LV Name                lv_swap
  VG Name                vg_rhel65x64
  LV UUID                kuugDy-qmsW-ZTy2-3KOd-XHGc-r7zX-dT8Mpm
  LV Write Access        read/write
  LV Creation host, time rhel65x64, 2016-04-17 15:10:05 +0800
  LV Status              available
  # open                 1
  LV Size                1.60 GiB
  Current LE             409
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
[root@rhel65x64 ~]# resize2fs /dev/vg_rhel65x64/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_rhel65x64/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/vg_rhel65x64/lv_root to 7839744 (4k) blocks.
The filesystem on /dev/vg_rhel65x64/lv_root is now 7839744 blocks long.


[root@rhel65x64 ~]# df -h
Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/vg_rhel65x64-lv_root   30G  2.6G   26G  10% /
tmpfs                             2.0G   76K  2.0G   1% /dev/shm
/dev/sda1                         485M   39M  421M   9% /boot