第2章 LVM-VDO requirements

VDO requires a fixed 38 MB of RAM and several variable amounts:

The Universal Deduplication Service (UDS) requires a minimum of 250 MB of RAM, which is also the default amount that deduplication uses. You can configure the value when formatting a VDO volume, because the value also affects the amount of storage that the index needs.

The memory required for the UDS index is determined by the index type and the required size of the deduplication window. The deduplication window is the amount of previously written data that VDO can check for matching blocks.