A data center technician is installing a new 2U server into a standard 19-inch 4-post rack. The technician successfully attaches the outer rails to the rack's vertical posts. However, when attempting to attach the corresponding inner rails to the server chassis, the mounting studs and keyhole slots do not align. Which of the following is the MOST likely cause of this issue?
The rail kit is for a different U-size than the server.
The server chassis is designed exclusively for 2-post rack installations.
The rack posts are threaded instead of square.
The rail kit is not compatible with the specific server model.
The correct answer is that the rail kit is not compatible with the specific server model. Server rail kits are frequently designed for specific models or generations of servers from a manufacturer, even within the same U-size. Differences in chassis dimensions, weight, and the precise location of mounting points necessitate a compatible rail kit for a secure and correct installation.
A rail kit for a different U-size would also be incompatible, but the most specific and common issue is incompatibility with the server model itself, even when the U-size is correct. Therefore, the selected answer is the most likely cause.
The scenario states that the outer rails were successfully attached to the rack posts, which rules out incompatibility with the rack's post type (threaded vs. square).
It is highly improbable that a 2U server would be designed exclusively for 2-post racks due to its weight and depth; such servers almost always require the stability of a 4-post rack.