An Implementation Engineer is assigned to install a 4X Module 9.

A "4X Module" kit is specifically designedto widen an existing write group(RAID set).

Write Group Geometry:In standard FlashArray//X configurations, DirectFlash Modules (DFMs) operate in "Write Groups" (typically 10 modules wide for a standard data pack). However, to offer more flexible entry points or capacity expansion options, Pure Storage allows configurations that start with smaller write groups (e.g., 6 modules).

Widening:When a customer wants to expand capacity or performance on these smaller configurations without adding a full new 10-pack, they can purchase a widening kit (in this case, 4 modules).

Process:The Implementation Engineer installs these 4 modules into the empty slots. The Purity operating system then logically integrates these new drives into the existing narrow write group, "widening" it to the standard width (e.g., 6 + 4 = 10). This operation redistributes parity and data across the full set of 10 drives, improving performance and efficiency.