[root@AY121110111722e1c8917 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda1             20G  1.2G   18G   6% /
tmpfs                 245M     0  245M   0% /dev/shm

[root@AY121110111722e1c8917 ~]# fdisk -lDisk /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: 0x00073f45Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1        2611    20970496   83  LinuxDisk /dev/xvdb: 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: 0x00000000

[root@AY121110111722e1c8917 ~]# 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 0x8121207b.
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 toswitch off the mode (command 'c') and change display units tosectors (command 'u').Command (m for help): n
Command actione   extendedp   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-2610, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): 2610Command (m for help): wq
The partition table has been altered!Calling ioctl() to re-read partition table.
Syncing disks.
[root@AY121110111722e1c8917 ~]# 

[root@AY121110111722e1c8917 ~]# fdisk -lDisk /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: 0x00073f45Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1        2611    20970496   83  LinuxDisk /dev/xvdb: 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: 0x8121207bDevice Boot      Start         End      Blocks   Id  System
/dev/xvdb1               1        2610    20964793+  83  Linux
[root@AY121110111722e1c8917 ~]# 

[root@AY121110111722e1c8917 ~]# mkfs.ext3 /dev/xvdb1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1310720 inodes, 5241198 blocks
262059 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
160 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: doneThis filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@AY121110111722e1c8917 ~]# 

[root@AY121110111722e1c8917 ~]# echo '/dev/xvdb1 /mnt/xvdb1 ext3 defaults 0 0' >> /etc/fstab
[root@AY121110111722e1c8917 ~]# cat /etc/fstab #
# /etc/fstab
# Created by anaconda on Mon Dec 17 09:06:53 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=887b0b9e-449b-414e-a11d-cd94093e3fe1 /                       ext3    defaults        1 1
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
xenfs                   /proc/xen               xenfs   defaults        0 0
/dev/xvdb1              /mnt/xvdb1              ext3    defaults        0 0
[root@AY121110111722e1c8917 ~]# 

[root@AY121110111722e1c8917 ~]# mount -a

[root@AY121110111722e1c8917 ~]# mkdir /mnt/xvdb1

[root@AY121110111722e1c8917 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda1             20G  1.2G   18G   6% /
tmpfs                 245M     0  245M   0% /dev/shm
/dev/xvdb1             20G  173M   19G   1% /mnt/xvdb1
[root@AY121110111722e1c8917 ~]#