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General Reference

LVM Architecture

The basic working principle of LVM is to abstractly encapsulate EBS disks at the bottom, and present them to the upper application in the form of logical volumes.

  1. The storage device at the bottom is EBS disks.
  2. Format EBS disks into Physical Volumes (PV). Physical volume can be a partition on the actual EBS disk, an entire EBS disk, or a RAID device.
  3. Create a volume group on the physical volumes. A volume group includes a minimum of one physical volume. After the volume group is created, physical volumes can be dynamically added to it.
  4. Create logical volumes on the volume group. The unallocated space in the volume group can be used for creating new logical volumes, and the space can be dynamically expanded or narrowed after the logical volumes are created.
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