[root@localhost /]# fdisk -l

Disk /dev/xvdb: 429.5 GB, 429496729600 bytes

255 heads, 63 sectors/track, 52216 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

[root@localhost /]# fdisk /dev/xvdb

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

Building a new DOS disklabel with disk identifier 0x7f095069.

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): n 输入n进行分区

Command action

e extended

p primary partition (1-4)

p 输入p为主分区，e为逻辑分区

Partition number (1-4): 1 （由于是新盘我们输入1来分第一个主分区，共可以分4个主分区）

First cylinder (1-52216, default 1): 1 （选择该分区的起始磁盘数，如无特殊需求强烈建议选择默认，也就是1来分区（可直接按回车））

Last cylinder or +size or +sizeM or +sizeK (1-52216, default 52216):

定义该分区的大小，如果按默认（按回车）即是使用全部可用存储额，如分一个1G的空间，输入+1024m

Using default value 52216

Command (m for help): w 写入分区

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@localhost /]#

fdisk -l

Disk /dev/xvdb: 429.5 GB, 429496729600 bytes

255 heads, 63 sectors/track, 52216 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: 0x90b7ee49

    Device Boot      Start         End      Blocks   Id  System

/dev/xvdb1               1       52216   419424988+  83  Linux

[root@localhost /]# 
echo "/dev/xvdb1 /data2 ext4 defaults 0 0" >> /etc/fstab