The video surveillance workload is broken into two types of architectures, the centralized or distributed models. Both architectures have their advantages depending on the infrastructure being supported. Regardless of architecture choice, the value of the approach by Dell EMC is to focus on a best of breed, open, flexible storage architecture necessary to support various video management software (VMS) vendors and the deployment options for large-scale video surveillance systems. This approach allows for the surveillance systems to have an increased number of cameras, multiple resolution rates, and longer retention periods, with significant efficiency gains over closed architectures with no integrator or customer choices.
The distributed architecture places storage systems closer to the cameras at remote or distributed locations to localize video management, capture and processing. This allows for greater functionality and processing without heavy network requirements. Also, by storing the data locally at distributed locations, it becomes feasible to enable data integration into access control and intrusion detection/security applications.
The centralized storage, as a highly scalable central repository for all distributed storage systems, may also have many cameras located within the centralized location or over a robust metropolitan area or campus area network. This architecture allows for periodic transfer of the entire data set rather than real time IP traffic for all cameras. In a large, multi-site configuration, this can be incredibly valuable to a business as the load on the wide area network is greatly reduced, especially when considering the year over year recurring cost of high-speed, low latency WAN connections that are needed for this use case.
Centralized deployment challenges include ease of deployment and maintenance as the system evolves, performance, ease of scale, support for fault tolerance or high availability applications, and retrieving distributed data via limited bandwidth.
Distributed deployment challenges include an ever-increasing number of remote locations, price sensitivity, easy of management and ease of deployment.
Standards based interfaces with VMS recorders, scalability, ease of use, simplicity, data availability and data integrity are all necessary features of a storage system in the video surveillance use case. For a centralized system, the loosely coupled scale out architecture is best suited. For a distributed configuration, the scale up architecture is best suited.
The centralized model would be addressed without the need for replication, but the interoperability values still apply for these customers.
The Spiderchart below shows the distribution and weighting of the primary workload requirements for this use case.