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

[root@localhost ~]# fdisk -l  //磁盘命令

Disk /dev/sda: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000c4cb5  Device Boot   Start     End   Blocks  Id System/dev/sda1  *      1     64   512000  83 LinuxPartition 1 does not end on cylinder boundary./dev/sda2       64    2611  20458496  8e Linux LVMDisk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xd0f5c869  Device Boot   Start     End   Blocks  Id System/dev/sdb1        1    2610  20964793+ 83 LinuxDisk /dev/sdc: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

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

[root@localhost ~]# fdisk /dev/sdc #进入磁盘Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0x45a3cadb.Changes will remain in memory only, until you 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 display units to     sectors (command 'u').Command (m for help): mCommand 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 system id  u  change display/entry units  v  verify the partition table  w  write table to disk and exit #保存退出  x  extra functionality (experts only)

知道命令之后就可以进行分区了