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In computer related services business world  - DSS means a Data Storage Service Server.  Big corporations have big data storage services in highly reliable and secure protection against failure.

The data is spread across multiple server machines for redundancy. Mirror servers have same data as the main DSS server. Mirror servers are used to serve more users and reduce network congestion.

DSS could have some commercial meanings like Direct sun shade - sun control film that is pasted on big glasses on the outside of glass buildings. They used to be pasted on cars for cooling in hot summers.