如果一個單元已經(jīng)處于運(yùn)行模式，另–個將要進(jìn)入運(yùn)行模式，已經(jīng)處于運(yùn)行狀態(tài)的單元會繼續(xù)成為激活單元而處于模式轉(zhuǎn)換中的單元會變成備份單元。不管是首要單元還是備用單元的邏輯都是這樣的。激活單元和備份單元之間的同步

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