小于2T的直接用 fdisk  分区，大于2T的 用parted

fdisk  -l 
[root@nfs ~]# parted  /dev/xvde
GNU Parted 2.1
Using /dev/xvde
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel gpt                                                     
(parted) print                                                           
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvde: 5498GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt Number  Start  End  Size  File system  Name  Flags
(parted) mkpart primary 0  5497.6G
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? i                                                         
(parted) print                                                           
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvde: 5498GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt Number  Start   End     Size    File system  Name     Flags
 1      17.4kB  5498GB  5498GB               primary  
[root@nfs ~]# mkfs.ext4  /dev/xvde1
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
335872 inodes, 1342183 blocks
67109 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1375731712
41 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 Writing inode tables: done                           
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

剩下的
mkfs.ext4  /dev/sdb1
mkidr  backup
mount  /dev/sdb1  /backup