The VCF 9.1 Upgrade Is an Operating Model Project, Not a Patch Window

This article explains that upgrading to VCF 9.1 is not a routine maintenance window but a project that demands a new operating model. It emphasizes that VCF Operations must be upgraded to version 8.18 before core components, and is mandatory in VCF 9.x, changing the upgrade path. The upgrade exposes ownership boundaries across teams (SDDC Manager, NSX, vCenter, ESXi, Aria Operations, security, backup, etc.), requiring clear decision rights and readiness evidence. The key question shifts from 'when is the patch window?' to 'is the organization ready to operate the platform as VCF 9.1 expects?' The article provides a mental model of upgrade readiness as a chain of ownership, highlighting that weak links can derail governance.