机房的电力架构：UPS、柴发与双路供电
数据中心的可靠性是从供电架构里长出来的：本文拆解从市电引入到机架 PDU 的供电链条，讲清 UPS、柴油发电机与双路供电各自的职责边界，以及 Tier 分级背后的可靠性逻辑。
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