LVM logical volume expansion and reduction

Every linux user will encounter this dilemma when installing linux: How to accurately evaluate and allocate the capacity of each hard disk partition when partitioning the system, because the system administrator should not only consider the capacity required by a certain partition, but also anticipate the maximum capacity that may be required after the partition. If the estimation is inaccurate, the Administrator may even need to back up the entire system, clear the hard disk, re-partition the hard disk, and restore the data to the new partition when a partition is insufficient.

Although there are many tools available for Dynamic Disk adjustment, such as PartationMagic, it cannot completely solve the problem because a partition may be exhausted again; in addition, this requires a reboot of the system. For many critical servers, shutdown is unacceptable and new hard disks are added, if you want a file system that can span multiple hard drives, the partition adjustment program cannot solve the problem.

Therefore, the perfect solution should be to adjust the file system size without downtime, so that the file system can easily span across different disks and partitions. Fortunately, the logical disk volume management LVM and LogicalVolumeManager provided by Linux is a perfect solution.

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