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目前很多VPS或者云主机出于数据保护机制，主机都可以最少划分2块硬盘，一块用来存放用户数据（即网站数据等），一块用来存放系统，这样在您的系统出现问题之后后台选择重装系统，所以在购买VPS或者云主机之后，要手动将另外一块硬盘挂载到用户数据的目录。这个机制有一个缺点就是存放系统的分区将无法应用于用户数据（网站数据等），所以如果您需要充分利用您的磁盘，您可以挂载磁盘为LVM格式，教程参考这里：Linux VPS 挂载磁盘LVM格式(充分利用磁盘)

下面教程开始：

[root@MyVPS ~]# fdisk -l （查看磁盘分区）

Disk /dev/xvdb: 7516 MB, 7516192768 bytes
255 heads, 63 sectors/track, 913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/xvdb doesn’t contain a valid partition table
Disk /dev/xvda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 13 104391 83 Linux
/dev/xvda2 14 1044 8281507+ 8e Linux LVM
/dev/xvda3 1045 1305 2096482+ 8e Linux LVM

[root@MyVPS ~]# df -hal //

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
9.3G 1.2G 7.7G 13% /
proc 0 0 0 – /proc
sysfs 0 0 0 – /sys
devpts 0 0 0 – /dev/pts
/dev/xvda1 99M 29M 66M 31% /boot
tmpfs 151M 0 151M 0% /dev/shm
none 0 0 0 – /proc/sys/fs/binfmt_misc
sunrpc 0 0 0 – /var/lib/nfs/rpc_pipefs

[root@MyVPS ~]# fdisk /dev/xvdb //

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. 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)

Command (m for help): n //

Command action
e extended
p primary partition (1-4)

p //

 

Partition number (1-4): 1 //

 

First cylinder (1-913, default 1): //

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-913, default 913): //

Using default value 913

Command (m for help): w //

The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

[root@MyVPS ~]# mkfs -t ext3 /dev/xvdb1 //

mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
917504 inodes, 1833410 blocks
91670 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1879048192
56 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 21 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@MyVPS ~]# mount /dev/xvdb1 /home //[root@MyVPS ~]# df -hal

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
9.3G 1.2G 7.7G 13% /
proc 0 0 0 – /proc
sysfs 0 0 0 – /sys
devpts 0 0 0 – /dev/pts
/dev/xvda1 99M 29M 66M 31% /boot
tmpfs 151M 0 151M 0% /dev/shm
none 0 0 0 – /proc/sys/fs/binfmt_misc
sunrpc 0 0 0 – /var/lib/nfs/rpc_pipefs
/dev/xvdb1 6.9G 144M 6.4G 3% /home

[root@MyVPS ~]# echo "/dev/xvdb1 /home ext3 defaults 1 2" >> /etc/fstab //添加开机自动挂载//

注意事项：
1.请勿在有数据存于/home目录的情况下进行此操作，请注意备份数据。如果使用的是WDCP应为/www目录

2.理论上可以实现重装系统第二块磁盘的数据不丢失，但是我们依然强烈建议您备份好自己的数据！