This holds the rn — the Relative Name — of the hardware-definition record describing the physical NVMe drive-bay and PCI-slot layout a specific server model ships with; it is only the final path segment identifying this object relative to its immediate parent, not the whole dn. Because a NVMe drive-bay hardware definition is nested under a parent object in UCS Manager's tree, the rn is what distinguishes it from sibling entries under that same parent without repeating the full ancestor path every time. For an object whose dn is 'capabilities/nvme-def-1', the rn would just be the trailing segment 'nvme-def-1'.