An improved redundant computing apparatus has a chassis assembly configured to (i) mount to a standard electronic equipment rack and (ii) consume substantially 1U of space in a particular direction within the standard electronic equipment rack. The chassis assembly includes a housing
A midplane has plated through holes (PTHs) which form a first profile and a second profile. The first profile has (i) an overlapping portion which overlaps at least part of the second profile and (ii) a non-overlapping portion which does not overlap any part of the second profile. A firs