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+Warm data are accessed less frequently. To store them more efficiently, you can enable erasure coding.
+
+Benefit
+* Efficient memory usage and faster startup time. The volume server does not load index data into memory. 
+* RS(10,4) allows loss of 4 shards of data with 1.4x data size. Compared to 5x data size, it saves 3.6x disk space.
+