Linux VPS 挂载磁盘ext3格式(重装系统数据不丢失)
出于数据保护机制，我们的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：
# 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 IdSystem
/dev/xvda1 * 1 13 104391 83Linux
/dev/xvda2 14 1044 8281507+8eLinux LVM
/dev/xvda3 1045 1305 2096482+8eLinux LVM
# df -hal //*查看已划分区空间使用情况*//
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
9.3G1.2G7.7G13% /
proc 0 0 0 -/proc
sysfs 0 0 0 -/sys
devpts 0 0 0 -/dev/pts
/dev/xvda1 99M 29M 66M31% /boot
tmpfs 151M 0151M 0% /dev/shm
none 0 0 0 -/proc/sys/fs/binfmt_misc
sunrpc 0 0 0 -/var/lib/nfs/rpc_pipefs
# fdisk /dev/xvdb //*对硬盘/dev/xvdb进行增加分区操作*//
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 //*输入n新建分区*//
Command action
e extended
p primary partition (1-4)
p //*输入p主分区*//
Partition number (1-4): 1 //*输入1第一个分区*//
First cylinder (1-913， default 1): //*回车跳过*//
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-913， default 913): //*回车跳过*//
Using default value 913
Command (m for help): w //*输入W保存退出*//
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# mkfs -t ext3 /dev/xvdb1 //*将新分区xvdb1(此名称因系统而异)格式化为ext3格式*//
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.
# mount /dev/xvdb1 /home //*将新分区xvdb1挂载到目录/home*//
# df -hal
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
9.3G1.2G7.7G13% /
proc 0 0 0 -/proc
sysfs 0 0 0 -/sys
devpts 0 0 0 -/dev/pts
/dev/xvda1 99M 29M 66M31% /boot
tmpfs 151M 0151M 0% /dev/shm
none 0 0 0 -/proc/sys/fs/binfmt_misc
sunrpc 0 0 0 -/var/lib/nfs/rpc_pipefs
/dev/xvdb1 6.9G144M6.4G 3% /home
# 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。
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!
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