Question: How plurality of storage time and better ensure data consistency?

Question: How plurality of storage time and better ensure data consistency?
Suppose there are three storage, namely A, B, C, suppose A is closer to a source of storage
is to synchronize both B and C from A?
B is synchronized from the A, B and C sync from?

 

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Origin www.cnblogs.com/big1987/p/11118840.html