As a software solution, virtualization required the existing physical servers as well as shared storage technologies like SAN and NAS to survive and thrive. When virtualization first arrived in the market, the physical server model was dominating IT infrastructure. This consists of virtual machines (VMs) running on 3 or more clustered host servers connected by 2 network switches and backed by 1 or more shared storage appliances (SAN/NAS). Virtualization, the Precursor to Converged Infrastructure and HCIīefore HCI and converged infrastructure, virtualized infrastructure was organized into what we now call a 3-2-1 architecture (see image below). Alternatively, HCI vendors sell their software directly to end users, through resellers and integrators, for use as part of a reference architecture, or on an HCI-as-a-service basis, either on-premises or in a public cloud. HCI vendors either build their own appliances using common, off-the-shelf infrastructure (hardware, virtualization, operating system), or they engage with system vendors that package the HCI vendor’s software stack as an appliance. Gartner defines HCI as:Ī category of scale-out software-integrated infrastructure that applies a modular approach to compute, network and storage on standard hardware, leveraging distributed, horizontal building blocks under unified management. Definition: Hyperconvergence is an IT framework that combines storage, computing, and networking into a single system in order to reduce data center complexity, increase scalability, and reduce total cost of ownership (TCO).
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