# How to Configure RocksDB Block-Cache (3/4)

+ The cf size can be observed via the corresponding metrics.
+ Tips:
+ Configure the cf block-cache size based on the data size ratio of the corresponding cf. (Ignore this tip if the TiKV version is 3.0 or later.) 
+ Configure the size of block-cache and page-cache in a 1:1 ratio.
![`smart`](place-holder.png)

![`smart`](place-holder.png)

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