When you re-install the system partition, find something called LVM and find out to share with you

LVM is shorthand for Logical Volume Manager (Logical Volume management), a mechanism for managing disk partitions in a Linux environment, implemented by Heinz Mauelshagen on the Linux 2.4 kernel, Currently the latest version is: Stable version of 1.0.5, development version of 1.1.0-RC2, and LVM2 development. A common and difficult question that Linux users encounter when installing a Linux operating system is how to properly evaluate the size of each partition to allocate the appropriate hard disk space. Normal disk partition management mode after the logical partition can not change its size, when a logical partition does not hold a file, the file because of the upper file system restrictions, and can not be stored across multiple partitions, so also can not be placed on another disk. When you encounter a partition that is running out of space, the solution is usually to use symbolic links, or use a tool that resizes the partition, but this is only a temporary workaround and does not fundamentally solve the problem. With the advent of the logical volume management capabilities of Linux, these problems are solved, allowing users to easily adjust the size of each partition without the need for downtime.

This is the Baidu Encyclopedia, more detailed, you can look at

Http://baike.baidu.com/link?url=e-ySmhTGEnP0U0hozDKKhjJAS2a8kLS3xQHKkhyobUuYavWqZv4tPvLcZVM0gvaSzEyqPEsRl3woXu2OWCqdJ_

When you re-install the system partition, find something called LVM and find out to share with you