This defines the visual gap, as a layout string, inserted between groups of slots along the array's primary ('inline') axis. Drive bays on many Cisco servers are physically clustered in small groups with a visible divider between clusters, and this value tells the UCS Manager diagram renderer to reproduce that same grouping instead of drawing every slot evenly spaced. A value such as '4' leaves a small visible gap every few slots, matching hardware that groups its bays in fours with a divider between groups.