BOSS-S2: Dell Boot Optimized Storage Solution (BOSS-S2) Hot-Plug Rear Controller with Dual M.2 SSDs
Also listed as: 403-BCBY, 07DRW4, 7DRW4 · made by Marvell
The Dell BOSS-S2 is a Dell Boot Optimized Storage Solution (BOSS-S2) Hot-Plug Rear Controller with Dual M.2 SSDs providing hardware RAID 1 operating system boot redundancy for Dell PowerEdge R750, R650, R760, R660 servers.
Specifications
| Part number | BOSS-S2 |
|---|---|
| Brand | Dell |
| Made by | Marvell |
| Type | Boot devices |
| Other numbers | 403-BCBY, 07DRW4, 7DRW4 |
| Status | current |
| Interface | PCIe 3.0 x2 |
| Form factor | Rear chassis hot-plug dual sled module |
| Capacity (GB) | 480 |
| Raid levels | Hardware RAID 1 or Pass-Through |
About the BOSS-S2
The Dell BOSS-S2 is a Dell Boot Optimized Storage Solution (BOSS-S2) Hot-Plug Rear Controller with Dual M.2 SSDs engineered for dedicated hardware RAID 1 operating system boot storage. Supporting dual M.2 SATA solid-state drives, the BOSS-S2 offloads hypervisor and OS boot volumes from front storage bays, ensuring uninterrupted host booting independent of primary data storage pools.
Compatibility
Designed for Dell PowerEdge servers including R750, R650, R760, R660, the BOSS-S2 installs into dedicated chassis boot bays or PCIe slots. The BOSS-S2 supports M.2 SATA SSDs configured in hardware RAID 1 or pass-through mode, with validated driver support across VMware ESXi, Linux, and Windows Server.
How to identify a genuine unit
Genuine Dell units display a serialized label showing DP/N 403-BCBY, BOSS controller branding, and PCIe certification markings. In iDRAC Storage inventory, the BOSS-S2 controller reports as a recognized Dell boot adapter with drive status, RAID 1 mirror state, and firmware revision.
Buying used
When evaluating a pre-owned BOSS-S2, inspect the M.2 card slots, screw retention posts, and gold edge contacts for physical damage. Confirm that the hot-plug drive carriers for the BOSS-S2 slide smoothly, and verify in iDRAC that both M.2 SSDs initialize in a synchronized RAID 1 volume.
Fits these models
- Dell PowerEdge R750
- Dell PowerEdge R650
- Dell PowerEdge R760
- Dell PowerEdge R660
- Dell PowerEdge C6520
- Dell PowerEdge C6615
- Dell PowerEdge C6620
- Dell PowerEdge R HS5610
- Dell PowerEdge R HS5620
- Dell PowerEdge MX750c
- Dell PowerEdge MX760c
- Dell PowerEdge R350
- Dell PowerEdge R450
- Dell PowerEdge R550
- Dell PowerEdge R650xs
- Dell PowerEdge R6525
- Dell PowerEdge R660xs
- Dell PowerEdge R6615
- Dell PowerEdge R6625
- Dell PowerEdge R750xa
- Dell PowerEdge R750xs
- Dell PowerEdge R7525
- Dell PowerEdge R760xa
- Dell PowerEdge R760xd2
- Dell PowerEdge R760xs
- Dell PowerEdge R7615
- Dell PowerEdge R7625
- Dell PowerEdge R860
- Dell PowerEdge R960
- Dell PowerEdge T350
- Dell PowerEdge T550
- Dell PowerEdge T560
- Dell PowerEdge XE8545
- Dell PowerEdge XE8640
- Dell PowerEdge XE9640
- Dell PowerEdge XE9680
FAQ
What is the difference between BOSS-S1 and BOSS-S2?
BOSS-S1 is an internal PCIe add-in card requiring server shutdown to replace SSDs, while BOSS-S2 features rear hot-pluggable drive carriers serviceable while online.
Does BOSS-S2 support hot-swapping under VMware ESXi?
Yes, a degraded M.2 drive can be hot-swapped from the rear bay and will automatically rebuild the RAID 1 mirror.
Buying or selling BOSS-S2?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Dell Boot Optimized Storage Solution-S2 User Guide, checked 2026-10-27