Some of the 13th generation PowerEdge server backplanes supports both SAS/SATA and PCIe SSD drives in the same slot. These slots are wired to the primary storage controller (PERC) and a PCIe extender card. These slots are called “universal” slots. Backplane firmware provides information on the slots that support this feature. The backplane supports SAS/SATA disks or PCIe SSDs. Typically the four higher number slots are universal. For, example, in a universal backplane supporting 24 slots, slots 0-19 support only SAS/SATA disks while slots 20-23 support either SAS/SATA or PCIe SSD.
The roll-up health status for the enclosure provides the combined health status for all the drives in the enclosure. The enclosure link on the Topology page display the entire enclosure information, irrespective of which controller it is associated with. As two storage controllers (PERC and PCIe extender) can be connected to the same backplane, only the backplane associated with the PERC controller is displayed in System Inventory page.