HPE DL325 G11 8SFF X1NVME U.3 SEC P CA - P57009-B21

HPE P57009-B21 DL325 Gen11 8SFF x1 NVMe U.3 Secondary Drive Cage

Overview

The HPE P57009-B21 is a secondary drive cage assembly designed for the HPE ProLiant DL325 Gen11 platform, adding an 8-bay Small Form Factor (SFF) NVMe U.3 expansion zone to the base chassis. If you're scaling storage density on a DL325 Gen11 — whether for a video surveillance NVR backend, an edge analytics node, or a high-IOPS database workload — this cage is the factory-supported path to do it without migrating to a larger chassis. The P57009-B21 (often searched as P57009 B21) installs into the designated secondary cage bay, wires to the platform's NVMe backplane infrastructure, and presents the additional drive slots to the system as native U.3 NVMe — no HBA card required when the mainboard backplane already supports U.3 tri-mode.

Key Features

• 8x SFF NVMe U.3 Bays: U.3 is the tri-mode interface that accepts NVMe, SAS, and SATA drives in the same physical slot — giving you flexibility to mix drive types as workload requirements change, without swapping backplanes.
• DL325 Gen11 Platform Fit: Engineered specifically for the DL325 Gen11 chassis geometry and backplane routing. Forcing a non-matching cage into a Gen11 bay risks misaligned power connectors and unsupported firmware paths — use the correct HPE-matched assembly.
• Low Assembly Weight (0.64 lb): At 0.64 lb, the cage itself adds negligible load to the chassis balance. Relevant when calculating populated drive tray weight for rail/rack static load compliance.
• Multi-Country Supply Chain: Sourced across CN, CZ, JP, MX, and SG manufacturing sites — standard for HPE enterprise components. Factory-new, genuine HPE, no grey-market risk.

Integration & Compatibility

The P57009-B21 is compatible with the HPE ProLiant DL325 Gen11 server line. Verify your chassis option order and backplane configuration before purchasing — the DL325 Gen11 ships in several storage configurations (NVMe-only, SAS/SATA, hybrid), and the secondary cage must match the backplane already installed. For HPE server accessories and storage options, confirm the base server's configured storage zones before ordering a secondary cage. If you're building out a network video recorder or edge compute node, pair this with NVMe SSDs rated for 24/7 write endurance — consumer NVMe drives are not appropriate for continuous write workloads.

Frequently Asked Questions

Q: What server is the P57009-B21 compatible with?

A: The P57009-B21 is designed for the HPE ProLiant DL325 Gen11. Verify your chassis storage configuration and backplane type before ordering.

Q: What drive interface does the P57009-B21 support?

A: This cage supports U.3 NVMe drives in an SFF bay configuration. U.3 is a tri-mode interface that can also accept SAS or SATA drives depending on the backplane firmware configuration.

Q: How many drive bays does the P57009-B21 add?

A: The P57009-B21 provides 8 SFF drive bays in the secondary cage position of the DL325 Gen11.

Q: What does P57009-B21 weigh?

A: The assembly weighs 0.64 lb without drives installed.

James Everett

The P57009-B21 is a platform-specific secondary cage — and that specificity is the point. On the DL325 Gen11, HPE locked the secondary bay geometry and backplane signaling to matched option kits precisely because U.3 tri-mode requires coordinated backplane firmware to negotiate drive protocol correctly. Drop in a non-HPE cage and you'll get the bays physically, but the drive enumeration and hot-plug signaling paths are unsupported — a support headache you don't want mid-deployment.

Technical Highlights:

• U.3 Tri-Mode Interface: Accepts NVMe, SAS, and SATA in the same bay slot — lets you start with NVMe for performance and repurpose slots for SAS archive drives later without a backplane swap.
• 8 SFF Bays: Doubles the drive slot count on a single-cage DL325 Gen11 baseline, meaningful for video retention workloads where raw capacity and concurrent write streams both matter.
• 0.64 lb Cage Weight: Negligible chassis impact — populated drive weight (typically 0.2–0.3 lb per NVMe SFF drive) dominates the rack load calculation, not the cage itself.

Deployment Considerations:

• Confirm your DL325 Gen11 chassis shipped with the NVMe-capable backplane variant — the SAS/SATA-only backplane does not support U.3 NVMe enumeration regardless of cage installed.
• Multi-country origin (CN, CZ, JP, MX, SG) is standard HPE supply chain practice, but if your deployment has TAA or NDAA supply-chain documentation requirements, verify the specific unit's country of manufacture on the shipping label — the option code alone does not guarantee a single origin.

Best fit: DL325 Gen11 deployments expanding on-server storage for edge video analytics or high-density NVR backends where adding a second server is not justified by the workload — this cage gets you to 16 SFF slots in a 1U footprint.