linux下使用fdisk命令进行硬盘分区

添加一块硬盘

1. # fdisk -l

1. Disk /dev/vdb: 53.7 GB, 53687091200 bytes

1. 16 heads, 63 sectors/track, 104025 cylinders

1. Units = cylinders of 1008 * 512 = 516096 bytes

1. Sector size (logical/physical): 512 bytes / 512 bytes

1. I/O size (minimum/optimal): 512 bytes / 512 bytes

1. Disk identifier: 0x00000000

用fdisk命令进入分区界面

1. # fdisk /dev/vdb

1. Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

1. Building a new DOS disklabel with disk identifier 0xb5f18769.

1. Changes will remain in memory only, until you decide to write them.

1. After that, of course, the previous content won‘t be recoverable.

1. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

1. WARNING: DOS-compatible mode is deprecated. It‘s strongly recommended to

1. switch off the mode (command ‘c‘) and change display units to

1. sectors (command ‘u‘).

1. Command (m for help):

1. Command (m for help): n    // 输入n新建一个分区

1. Command action

1. e   extended    //e是扩展分区

1. p   primary partition (1-4)    //p是主分区

1. p   //选择p

1. Partition number (1-4): 1     //分区号

1. First cylinder (1-104025, default 1):     //默认回车就行

1. Using default value 1

1. Last cylinder, +cylinders or +size{K,M,G} (1-104025, default 104025): 25600M     //可以输入具体要分多少空间给这个分区，这里我分25G

1. 参考：

1. //Supported: 10^N: KB (KiloByte), MB (MegaByte), GB (GigaByte)

1. 2^N: K  (KibiByte), M  (MebiByte), G  (GibiByte)

分第二个分区

1. Command (m for help): n

1. Command action

1. e   extended

1. p   primary partition (1-4)

1. p

1. Partition number (1-4): 2

1. First cylinder (52015-104025, default 52015):

1. Using default value 52015

1. Last cylinder, +cylinders or +size{K,M,G} (52015-104025, default 104025):        //这里直接回车默认所有空间

1. Using default value 104025

查看刚刚分的2个区。可以看到vdb1和vdb2

1. Command (m for help): p    //输入p查看分区

1. Disk /dev/vdb: 53.7 GB, 53687091200 bytes

1. 16 heads, 63 sectors/track, 104025 cylinders

1. Units = cylinders of 1008 * 512 = 516096 bytes

1. Sector size (logical/physical): 512 bytes / 512 bytes

1. I/O size (minimum/optimal): 512 bytes / 512 bytes

1. Disk identifier: 0xb7a8f045

1. Device Boot      Start         End      Blocks   Id  System

1. /dev/vdb1               1       52014    26215024+  83  Linux

1. /dev/vdb2           52015      104025    26213544   83  Linux

保存分区退出（一定要保存，不然得重来了。）

1. Command (m for help): w    //输入w保存退出

1. The partition table has been altered!

1. Calling ioctl() to re-read partition table.

1. Syncing disks.

查看分好的分区

1. # fdisk -l

1. Disk /dev/vdb: 53.7 GB, 53687091200 bytes

1. 16 heads, 63 sectors/track, 104025 cylinders

1. Units = cylinders of 1008 * 512 = 516096 bytes

1. Sector size (logical/physical): 512 bytes / 512 bytes

1. I/O size (minimum/optimal): 512 bytes / 512 bytes

1. Disk identifier: 0xb7a8f045

1. Device Boot      Start         End      Blocks   Id  System

1. /dev/vdb1               1       52014    26215024+  83  Linux

1. /dev/vdb2           52015      104025    26213544   83  Linux

格式化分区

1. # mkfs.ext3 /dev/vdb1

1. # mkfs.ext3 /dev/vdb2

创建挂载文件夹

1. # mkdir /vdb1 /vdb2

挂载分区到文件夹

1. # mount /dev/vdb1 /vdb1

1. # mount /dev/vdb2 /vdb2

分区完成，数据写入挂载的文件夹就写入到硬盘了。

但是重启之后linux不会自动挂载，需要在/etc/fstab文件添加后面2条。保存之后下次重启就会自动挂载了。

1. # vim /etc/fstab

1. tmpfs                   /dev/shm                tmpfs   defaults        0 0

1. devpts                  /dev/pts                devpts  gid=5,mode=620  0 0

1. sysfs                   /sys                    sysfs   defaults        0 0

1. proc                    /proc                   proc    defaults        0 0

1. /dev/vdb1               /vdb1                   ext3    defaults        1 2

1. /dev/vdb2               /vdb2                   ext3    defaults        1 2

另外：可通过cat /proc/partitions 查看分区信息

1. [[email protected] ~]# cat /proc/partitions

1. major    minor  #blocks name

1. 252        0   52428800 vda

1. 252        1     512000 vda1

1. 252        2    7875584 vda2

1. 252       16   52428800 vdb

1. 252       17   26215024 vdb1

1. 252       18   26213544 vdb2

1. 253        0    7036928 dm-0

1. 253        1     835584 dm-1