Centos系统下硬盘扩容

装好CentOS后，发现空间太小，怎样才能增加硬盘容量？那就是再建一个硬盘：

打开虚拟经济的设置添加硬盘

查看现有的磁盘空间

fdisk -l

[root@localhost ~]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x000e4bd8

   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        2611    20458496   8e  Linux LVM

Disk /dev/sdb: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 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

我添加的是/dev/sdb

给新加的硬盘进行分区

fdisk /dev/sdb

输入m ，可以查看帮助信息

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):

增加新的分区

command (m for help):n 

选择基本信息分区，输入：p

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)

回车

 First cylinder (1-15908,default 1):Enter 
（这是回车是指分的默认大小）
     写入并退出 
        command (m for help):w 

然后格式化磁盘分区

 用ext4格式对/dev/sdb1进入格式化 

mkfs.ext4 /dev/sdb1

[root@localhost ~]# mkfs.ext4 /dev/sdb
mke2fs 1.41.12 (17-May-2010)
/dev/sdb is entire device, not just one partition!
无论如何也要继续? (y,n) y
/dev/sdb 已经挂载;will not make a 文件系统 here!
[root@localhost ~]#

因为我的扩展盘符已经挂上去了，在占用状态。

挂载分区

先创建一个挂载点

mkdir  /work

mount -t ext4 /dev/sdb1/work

查看挂载状态

df -h

[root@localhost ~]# df -h 
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   18G   11G  6.2G  63% /
tmpfs                         932M   72K  932M   1% /dev/shm
/dev/sda1                     485M   40M  421M   9% /boot
/dev/sdb                      5.0G  138M  4.6G   3% /work
[root@localhost ~]# 

将挂载的目录加入开机自动挂载

  /dev/sdb1 /work ext4 errors=remount-ro 0 1 

完成