linux fdisk分区

沈阳格力专卖店

　　测试环境
[root@bright ~]# cat /etc/centos-release && uname -r
CentOS release 6.6 (Final)
2.6.32-504.el6.x86_64　　

　　分区步骤
[root@bright ~]# fdisk -l   查看当前磁盘分区
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

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: 0x00024393
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26         287     2097152   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3             287        2611    18668544   83  Linux
[root@bright ~]# fdisk /dev/sdb      #对/dev/sdb进行分区
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xb5c5077f.
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): m        #输入m查看帮助
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): n        #添加一个分区
Command action
   e   extended
   p   primary partition (1-4)
p                               #创建扩展分区
Partition number (1-4): 1        #分区编号
First cylinder (1-652, default 1):     #开始的柱面
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-652, default 652): 200 #分区大小
Command (m for help): w        #写入分区表
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@bright ~]# mkfs.ext4 /dev/sdb1        #格式化分区
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
100464 inodes, 401617 blocks
20080 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=415236096
13 block groups
32768 blocks per group, 32768 fragments per group
7728 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
正在写入inode表: 完成                           
Creating journal (8192 blocks): 完成
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 38 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.