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使用虚拟机时发现磁盘空间不够了，需要挂载一个磁盘以供继续使用，但是磁盘不是添加就可以使用的，还需要进行挂载。
一、添加磁盘
添加加新硬盘重启服务器
添加完之后就可以重启机器了，如果你机器是开启的，进入系统并不能看见你刚添加的那块磁盘，只有等系统重启，重新加载之后才会显示安装的那块磁盘
二、进入系统
使用root用户进入系统
三、 查看硬盘信息
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[root@localhost ~]# fdisk -l //磁盘命令
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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: 0x000c4cb5
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: 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: 0xd0f5c869
Device Boot Start End Blocks Id System
/dev/sdb1 1 2610 20964793+ 83 Linux
Disk /dev/sdc: 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: 0x00000000
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可以看到这台机器加载了三个磁盘sda、sdb、sdc
其中sda是初始磁盘，sdb已经初始化且经过使用，sdc是刚刚加载的，未格式化的新磁盘
四、创建新硬盘分区
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[root@localhost ~]# fdisk /dev/sdc #进入磁盘
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x45a3cadb.
Changes will remaininmemory only,untilyou decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command'c') and change displayunitsto
sectors (command'u').
Command (mforhelp): m
Command action
a toggle a bootable flag #设定可启动标记
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition #删除一个分区
l list known partition types#各分区类型所对应的ID
m print this menu #菜单
n add a new partition #添加一个分区
o create a new empty DOS partition table
p print the partition table #显示该磁盘下的当前分区信息
q quit without saving changes#不保存退出
s create a new empty Sun disklabel
t change a partition's systemid
u change display/entryunits
v verify the partition table
w write table to disk andexit#保存退出
x extra functionality (experts only)
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知道命令之后就可以进行分区了
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Command (mforhelp): p//打印分区信息,可以看到当前并没有分区
Disk/dev/sdc: 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/Osize (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x45a3cadb
Device Boot Start End Blocks Id System
Command (mforhelp): n//创建一个新的分区
Command action
e extended//输入e为创建扩展分区
p primary partition (1-4)//输入p为创建逻辑分区
p
Partition number (1-4): 1//划分逻辑分区
First cylinder (1-2610, default 1)://我这里直接回车,是不想把该磁盘分成多个分区,把整个磁盘作为1个分区
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610):
Using default value 2610
Command (mforhelp): p//再次查看可以看到该磁盘已经有1个分区了
Disk/dev/sdc: 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/Osize (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x45a3cadb
Device Boot Start End Blocks Id System
/dev/sdc1 1 2610 20964793+ 83 Linux
Command (mforhelp): w//保存分区
The partition table has been altered!
Calling ioctl() to re-readpartition table.
Syncing disks.
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再次使用”fdisk -l”命令查看磁盘信息
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