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* * Think of the physical world today – where scaling an app means a complex task involving detailed sizing, procuring hardware, application downtime, then moving the application over to new hardware etc. Virtualization already made this process easier with hardware independent movement of apps – but with hot add, now applications can be provisioned in a “future proof” manner. As apps grow, as they get more and more intense over time and need more compute, memory or network/storage resources, admins can now scale them up dynamically – no disruption, no complex porting , on the fly. * * * Many applications are difficult to size – databases being a good example. Admins have to forecast capacity requirements for coming 3 years, then translate that estimate into system specs (CPU, memory). If they guess wrong, then the app has to be reprovisioned. This is a cause of downtime and major disruption to the application. With hot add, now applications can be provisioned in a “future proof” manner. As apps grow, as they get more and more intense over time and need more compute, memory or network/storage resources, admins can now scale them up dynamically and on the fly – without disrupting the app, and without requiring complex re-provisioning. In this example, the transaction rate (TPS) goes up, and as a result latency increases beyond the SLA limits. The VI Admin can hot-add capacity to the VM, and SQL 2008 automatically detects this new capacity. In a matter of minutes – without downtime – SQL stabilizes with new capacity, and the latency goes back down to within SLA requirements. 到现在为止，我们主要介绍了虚拟化平台，及用于基础架构服务和应用程序服务的产品。 现在，我们要将重点转移到基础架构中运行的应用程序上。 31 VMware vCenter Server provides greater operational control of vSphere environments through automation and deep visibility into every level of virtual infrastructure. It scales to manage large environments and integrates with industry-leading systems management solutions for enterprise-wide system management. * 33 以