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AI基础架构到底如何选?25年前,我们讨论的是买服务器还是租机架。今天,我们讨论的是用公有云还是自建GPU集群。问题换了,但逻辑没变:架构选型,本质是在成本、控制权、弹性三者之间找平衡。适合快速试水。大模型推理、向量数据库、训练任务,一键调用,按量计费。代价:数据在别人家,长期成本高,大规模算力受限于quota。自建A100/H100集群,全栈自主可控。数据不出门,合规成本低,大规模推理边际成本低。代价:前期资本开支大,运维要求高,硬件迭代压力持续存在。适合谁:金融、政务、医疗等强合规场景,以及日均推理量超千万token的业务。训练在云,推理在本地;敏感数据本地跑,通用任务云上跑。Gartner 2026年最新报告力推:以本地为锚,云为弹性——混合架构正成为企业AI落地的首选路径。适合谁:已有一定IT资产,希望数据安全和成本兼顾的企业。如果训练数据涉及用户隐私、行业机密,优先考虑私有化或混合架构。日均token消耗低于5000万,公有云反而更经济;超过这个量级,自建集群的ROI就开始翻转。有没有MLOps团队?能不能维护Kubernetes+GPU驱动栈?没有的话,云托管是现实选择。很多企业一上来就堆GPU,搭了一个看起来像AI数据中心的东西,结果GPU闲置率超过60%。AI基础设施不是传统IDC的升级版。它的核心不是算力,是调度。能不能让GPU保持高利用率,决定了这套投入值不值。2026年,混合架构+弹性调度是主流。但更重要的是:先搞清楚业务要什么,再反推技术怎么配。25年IT经验告诉我:技术永远是手段,业务才是目的。
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