# Why multi-raft
+ Single `Raft` group
  + Can NOT scale
+ Multiple `Raft` group
  + The more data the more groups
  + Data rebalance by moving around replica and `leader`
+ Each group is called `Region`
  + `Region` handles a key range
![`smart`](TiKVRegionAndStorage_aa_001_20221005.png)

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