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第 2 章 LVM-VDO requirements

VDO on LVM has certain requirements on its placement and your system resources.

2.1. VDO memory requirements
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This section describes the RAM requirements for VDO volumes, including memory allocation for the VDO module and Universal Deduplication Service (UDS), to optimize storage efficiency and performance.

Each VDO volume has two distinct memory requirements:

The VDO module

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

  • 1.15 MB of RAM for each 1 MB of configured block map cache size. The block map cache requires a minimum of 150 MB of RAM.
  • 1.6 MB of RAM for each 1 TB of logical space.
  • 268 MB of RAM for each 1 TB of physical storage managed by the volume.
The UDS index

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.

Expand
Index typeDeduplication window

Dense

1 TB per 1 GB of RAM

Sparse

10 TB per 1 GB of RAM

注意

The minimal disk usage for a VDO volume using default settings of 2 GB slab size and 0.25 dense index, requires approx 4.7 GB. This provides slightly less than 2 GB of physical data to write at 0% deduplication or compression.

Here, the minimal disk usage is the sum of the default slab size and dense index.

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