CentOS系统挂载数据盘

按照官方发布的挂载数据盘帖子操作没有成功 代码如下
第一步
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[root@AY140425115133Z ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       20G  4.9G   14G  26% /
tmpfs           1.9G     0  1.9G   0% /dev/shm
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第二步
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[root@AY140425115133Z ~]# fdisk -l


Disk /dev/xvda: 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: 0x0007ce89


    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1        2611    20970496   83  Linux


Disk /dev/xvdb: 137.4 GB, 137438953472 bytes
255 heads, 63 sectors/track, 16709 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: 0xa3095856


    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1               1       16710   134215680    f  W95 Ext'd (LBA)
/dev/xvdb5               1       16710   134214656    7  HPFS/NTFS
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第三步（ 出现重复要求输入命令）
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[root@AY140425115133Z ~]# fdisk /dev/xvdb


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): n^H
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
p
Partition number (1-4): 1
Partition 1 is already defined.  Delete it before re-adding it.


Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
p
Partition number (1-4): 2
No free sectors available


Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
p
Partition number (1-4): 1
Partition 1 is already defined.  Delete it before re-adding it.


Command (m for help): wp
The partition table has been altered!


Calling ioctl() to re-read partition table.
Syncing disks.
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第四步
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准备格式化 [root@AY140425115133Z ~]# mkfs.ext3 /dev/xvdb1  后面没有操作了，怕出错，求高手指点指点