fdisk 磁盘分区

、[root@test4 ~]# fdisk /dev/sda  //对sda磁盘进行分区

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

The number of cylinders for this disk is set to .
There is nothing wrong with that, but this is larger than ,
and could in certain setups cause problems with:
) software that runs at boot time (e.g., old versions of LILO)
) booting and partitioning software from other OSs
    (e.g., DOS FDISK, OS/ FDISK)
Warning: invalid flag 0x0000 of partition table  will be corrected by w(rite)

Command (m for help): m          //输出帮助信息
 Command action
    a   toggle a bootable flag    //设置启动分区
    b   edit bsd disklabel        //编辑分区标签
    c   toggle the dos compatibility flag
    d   delete a partition        //删除一个分区
    l   list known partition types  //列出分区类型
    m   print this menu           //输出帮助信息
    n   add a new partition       //建立一个新的分区
    o   create a new empty DOS partition table //创建一个新的空白DOS分区表
    p   print the partition table    //打印分区表
    q   quit without saving changes  //退出不保存设置
    s   create a new empty Sun disklabel
    t   change a partition's system id  //改变分区的ID
    u   change display/entry units    //改变显示的单位
    v   verify the partition table    //检查验证分区表
    w   write table to disk and exit  //保存分区表
    x   extra functionality (experts only)
Command (m for help):n
Command action
   e   extended                 //e是扩展分区
   p   primary partition (-)  //p是主分区
p
Partition number (-):        //定义分区数量   --主分区最多只能有四个
First cylinder (-, default ):
Last cylinder or +size or +sizeM or +sizeK (-, default ): +100M

Command (m for help): w          //保存刚才的配置信息。
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error : 无效的参数.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.

、[root@test6 ~]# fdisk /dev/sda

The number of cylinders for this disk is set to .
There is nothing wrong with that, but this is larger than ,
and could in certain setups cause problems with:
) software that runs at boot time (e.g., old versions of LILO)
) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/ FDISK)

Command (m for help): n
First cylinder (-, default ):
Using default value
Last cylinder or +size or +sizeM or +sizeK (-, default ): +100M     

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 : 设备或资源忙.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
3、[root@test6 ~]# partprobe /dev/sda //对硬盘进行更新
   [root@test6 ~]# fdisk -l

Disk /dev/sda: 21.4 GB,  bytes
heads,  sectors/track,  cylinders
Units = cylinders of  *  =  bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *                                Linux
/dev/sda2                            +    Linux swap / Solaris
/dev/sda3                              8e  Linux LVM
/dev/sda4                               Extended
/dev/sda5                              Linux
/dev/sda6                               Linux
4、[root@test6 ~]# mkfs.ext3 /dev/sda6  //需要先进行格式化，才能使用 。mkfs -t ext3 /dev/sda5 （mkfs.ext3 一样效果 -t 指定类型 -b 指定block大小·）
mke2fs 1.39 (-May-)
Filesystem label=
OS type: Linux
Block size= (log=)
Fragment size= (log=)
inodes,  blocks
blocks (5.00%) reserved for the super user
First data block=
Maximum filesystem blocks=
block groups
blocks per group,  fragments per group
inodes per group
Superblock backups stored on blocks:
        , , , , 

Writing inode tables: done
Creating journal ( blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every  mounts or
days, whichever comes first.  Use tune2fs -c or -i to override.

5、[root@test6 ~]# mount /dev/sda6 /mnt/sda7/  //进行挂载使用
anaconda-ks.cfg  install.log  install.log.syslog/
6、[root@test6 ~]# df -h
文件系统              容量  已用 可用 已用% 挂载点
/dev/sda5             .7G  .1G  .1G  % /
/dev/sda1              99M   12M   83M  % /boot
tmpfs                 252M       252M   % /dev/shm
/dev/hdc              .9G  .9G      % /mnt/cdrom
/dev/sda6              99M  5.6M   89M   % /mnt/sda7