An Implementation Engineer is installing a FlashArray//XL chassis with two DirectFlash Shelves.

When planning the physical installation and rack space for a Pure Storage FlashArray//XL deployment, it is critical to understand the precise dimensions of the specific hardware components. Unlike the standard FlashArray//X series (which uses a 3U chassis), the FlashArray//XL utilizes a massive, high-density 5U chassis to accommodate its extreme performance architecture, high-wattage power supplies, and up to 40 DirectFlash Module with Distributed NVRAM (DFMD) slots.

When a customer needs to scale beyond the internal chassis capacity, they attach external DirectFlash Shelves (DFS). Regardless of the generation, a standard Pure Storage DirectFlash Shelf occupies 3U of rack space. Therefore, to calculate the absolute minimum continuous rack space required for this specific deployment, the Implementation Engineer must add the footprint of the main chassis and the two expansion shelves:

FlashArray//XL Chassis: 5U

DirectFlash Shelf 1: 3U

DirectFlash Shelf 2: 3U

Total Rack Space = 11U . Failing to secure at least 11U of contiguous space prior to the physical installation will result in racking delays and fragmented backend cable routing.