The Data Storage System is a comprehensive software and hardware solution for the organization of secure storage of information resources and the provision of guaranteed access to them. Data Storage Systems can be both part and base of the Data Center (DC).

There are several types of connection:

• Direct Attached Storage (DAS) - Direct Connected Storage Systems. When using DAS, the server has a personal connection to the CPA and is almost always a single user of the device. In this case, the server receives block access to the storage system, that is, accesses directly to the data blocks;
• Network Attached Storage (NAS) - Networked storage systems, also known as file servers, provide their network resources to clients over the network in the form of shared files. Clients use network file access protocols such as SMB (formerly known as CIFS) or NFS;
• Storage Area Network (SAN) - A storage network that provides clients with block access to network data. Devices in the SAN do not belong to a single server and can be used by all storage clients. It is possible to split the disk space into logical volumes that are allocated to separate host servers. These volumes are independent of the SAN components and their placement. Clients access the data warehouse using block-type access, as with DAS connectivity, but since SAN uses the network, storage devices can be located far away from clients;
• Universal Storage Systems (UnifiedStorage) combines NAS and SAN technologies in a single integrated solution. These versatile repositories make it possible to use both block and file type access to shared resources, in addition, the management of such devices is easier thanks to software that provides centralized management.