Final answer:
The necessary rack space height for a 2U rack mount server is 3.5 inches, as 1U equals 1.75 inches.
Step-by-step explanation:
The necessary rack space height to accommodate a 2U rack mount server is based on the standard unit of measurement in server racks, where 1U is equal to 1.75 inches. Therefore, a 2U server would require double that height, which is 3.5 inches. When installing a 2U server in a rack, it is important to ensure that at least 3.5 inches of vertical rack space is available to properly fit the server without any obstructions.