The integrated systems market consists of four segments: Integrated Infrastructure Systems (IIS) - Server, storage and network hardware are integrated to provide shared compute infrastructure. Integrated Reference Architecture (IRA) - These are products in which a specification for a logical set of hardware and/or software components for an integrated system are certified by two or more vendors. Ideally, these components have a common source of service and support. Integrated Stack Systems (ISS) - Server, storage and network hardware are integrated with application software to provide appliance or appliancelike functionality. Hyperconverged Integrated Systems (HCIS) - Compute, network and storage hardware are tightly coupled, eliminating the need for a traditional storage area network (SAN). Storage management functions, compute provisioning and additional, optional capabilities are delivered via the management software layer and/or hardware.