HPE Proliant Compute DL360 GEN12 MR932I-P 2SFF Stacking X2 BOX4 BOX5 PCIE SLOT1 - P85806-B21

HPE P85806-B21 ProLiant DL360 Gen12 MR932i-P 2SFF PCIe Stacking Kit

The HPE P85806-B21 is an internal PCIe stacking interconnect kit designed for the HPE ProLiant DL360 Gen12 server platform. It bridges the MR932i-P storage controller to the BOX4 and BOX5 2SFF drive bays via PCIe SLOT1, enabling the controller to address additional small-form-factor drive positions beyond the base configuration. If you are expanding storage capacity on a DL360 Gen12 equipped with the MR932i-P controller and need to activate the secondary 2SFF bay enclosures, this is the required stacking connector assembly.

Overview

Server storage configurations on the DL360 Gen12 are modular by design — the base build covers the primary bay, but activating BOX4 and BOX5 requires a physical interconnect between the RAID/HBA controller and those enclosures. The P85806-B21 (often searched as P85806 B21) provides exactly that link over the PCIe bus. Without it, drives installed in BOX4 and BOX5 will not be visible to the MR932i-P controller regardless of firmware or BIOS configuration. This is a factory-new, genuine HPE component sourced through authorized distribution channels — not a grey-market or parallel-import substitute.

Key Features

• PCIe Interface: routes the storage controller signal across the PCIe bus to reach BOX4 and BOX5 — the same high-bandwidth interconnect used throughout the DL360 Gen12 backplane architecture, so there is no protocol translation overhead or latency penalty between the controller and the additional drive bays.
• 2SFF Bay Activation (BOX4/BOX5): specifically enables the two additional small-form-factor drive enclosures on the DL360 Gen12, allowing you to populate those bays with NVMe or SAS/SATA 2.5-inch drives depending on your backplane configuration. Without this kit installed, those bay positions are electrically disconnected from the controller.
• MR932i-P Controller Pairing: engineered for use with the HPE MR932i-P Gen12 RAID controller via PCIe SLOT1. This is a platform-specific part — it is not a universal stacking cable and will not substitute for stacking kits designed for other controller families or server generations.
• Compact Form Factor (0.34 lb): at 0.34 lb this is a passive interconnect assembly, not an active card. Installation does not add meaningful thermal load or power draw to the chassis power budget.

Integration & Compatibility

The P85806-B21 is designed exclusively for the HPE ProLiant DL360 Gen12 platform in combination with the MR932i-P storage controller. Verify your server's storage configuration and controller model before ordering — Gen11 and earlier DL360 variants use different stacking interconnects that are not interchangeable with this kit. Consult the DL360 Gen12 QuickSpecs or HPE's server configurator to confirm BOX4/BOX5 compatibility with your specific chassis build. For broader server storage expansion planning, pairing this kit with the correct SFF drive backplane and compatible 2.5-inch drives is required for a functional configuration.

Frequently Asked Questions

Q: What server platform is the P85806-B21 compatible with?

A: The P85806-B21 is designed for the HPE ProLiant DL360 Gen12 server platform, specifically for use with the MR932i-P storage controller and PCIe SLOT1 to enable the BOX4 and BOX5 2SFF drive bays.

Q: Will this kit work with a DL360 Gen11 or earlier generation?

A: No. This is a Gen12-specific stacking interconnect. DL360 Gen11 and earlier platforms use different stacking components that are not interchangeable with the P85806-B21.

Q: What interface does the P85806-B21 use?

A: The P85806-B21 uses a PCIe interface, connecting via SLOT1 on the DL360 Gen12 to route the MR932i-P controller signal to the BOX4 and BOX5 2SFF drive bays.

Q: Is the P85806-B21 an active card or a passive interconnect?

A: It is a passive stacking interconnect assembly weighing 0.34 lb. It does not function as a standalone PCIe card and adds no meaningful power draw or thermal load to the chassis.

Q: Do I need this kit if I only have BOX1, BOX2, or BOX3 populated?

A: Only if you intend to activate BOX4 and BOX5. If your storage configuration uses only the primary 2SFF bays already connected to the MR932i-P, the P85806-B21 is not required.

Marty Allison

The P85806-B21 is one of those parts that looks minor on a BOM but stops a storage build cold if it is missing. It is the PCIe stacking interconnect that physically connects the MR932i-P controller in SLOT1 to BOX4 and BOX5 on the DL360 Gen12 — without it, those 2SFF bays are electrically invisible to the controller regardless of what drives you install or how you configure the RAID stack.

Technical Highlights:

• PCIe Bus Interconnect: routes controller-to-bay signaling over PCIe — the same bus fabric the DL360 Gen12 uses throughout, so no protocol bridging or added latency between the MR932i-P and the additional bays.
• BOX4/BOX5 Activation: specifically enables the two secondary 2SFF enclosures; without this kit, those bay positions cannot present drives to the OS or RAID controller under any configuration.
• Passive Assembly at 0.34 lb: no active components, no power rail draw to budget for — just a signal path. Thermal impact on the chassis is negligible.

Deployment Considerations:

• Confirm the target chassis is a DL360 Gen12 with the MR932i-P controller before ordering — this interconnect is generation-specific and will not drop into Gen11 or other DL360 variants.
• This kit covers the SLOT1-to-BOX4/BOX5 stacking path only. If your configuration requires additional stacking runs (BOX2/BOX3 or alternate controller placements), verify the correct secondary kit part numbers against the DL360 Gen12 QuickSpecs independently.

Best fit for DL360 Gen12 builds where the MR932i-P is the chosen storage controller and the deployment requires more than the base 2SFF bay count — high-density edge compute nodes, local NVR storage arrays, or any rack configuration where maximizing drive slots per 1U matters.