A Scalable Distributed 2-layered Data Store (SD2DS) for Internet of Things (IoT) systems

The problem of effective storing and processing of data is a very important aspect of every IoT application. To fulfill these requirements, NoSQL scalable datastores are frequently used. Scalable Distributed 2-layer Data Structures (SD2DS) are examples of such systems. SD2DS is a general purpose structure that can be used as a distributed datastore, easy to adapt to many different needs. In the paper, an enhanced architecture of IoT systems (denoted as IoT*) supplemented with SD2DS is proposed and evaluated. The combination brings many advantages, such as the possibility to create one unified structure consisting of many servers accessible by many clients, usage of different media for storage (such as RAM, hard disk, databases and cloud) and a single access method for both data and data sources.