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Leon Dupont
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Smart Array controller delivered excellent RAID performance.
851508-B21
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HPE Smart Array P542D - XL270d Gen9 Svr
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851508-B21
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- HPE Smart Array P542D - XL270d Gen9 Svr
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851508-B21 Overview
851508-B21-HPE Smart Array P542D - XL270d Gen9 Svr is a high-performance storage controller expansion card designed for HPE Gen9 servers. Built as a dedicated RAID controller, it connects via a PCIe x8 interface supporting the PCIe 3.0 generation. The card incorporates HPE’s trusted Smart Array P542 controller chipset and is engineered with hardware RAID capabilities to ensure data integrity and high availability. It is specifically optimized for storage expansion in enterprise server environments.
This expansion card features a low-profile bracket configuration ideal for space-constrained server racks, while also delivering robust operating system compatibility with Windows, Linux, and VMware ESXi. Its passive cooling design and 64-bit bus architecture support reliable, high-speed performance for intensive storage and server enhancement use cases. The product is purpose-built for organizations that require scalable and secure storage management solutions.
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851508-B21 Specifications
- Height
- 1.73 inches
- Width
- 4.33 inches
- Depth
- 9.65 inches
- Weight
- 1.20 lbs
- PCIe Version
- PCIe 3.0
- Product Type
- Expansion Card
- Interface
- PCIe x8
- Supported Ports
- N/A
- Max Data Rate
- N/A
- Capture Resolution
- N/A
- Capture Frame Rate
- N/A
- Low Profile Bracket
- Yes
- Cooling
- Passive
- Bus Width
- 64-bit
- Power Requirements
- 3.3V
- Use Case
- Storage Expansion
- Card Type
- Storage Controller
- Operating System Compatibility
- Windows / Linux / VMware ESXi
- Port Count
- N/A
- Full Height Bracket
- No
- Chipset / Controller
- HPE Smart Array P542 Controller
- RAID Levels Supported
- RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 / JBOD
- Product Name
- 851508-B21-HPE Smart Array P542D - XL270d Gen9 Svr
851508-B21 Use Case
Enterprise Virtualization Acceleration with HPE Smart Array P542D on XL270d Gen9 Server
A global financial services firm deploys the HPE 851508-B21 Smart Array P542D integrated into an XL270d Gen9 server to host 200+ VMware ESXi virtual machines. Leveraging 12 Gb/s SAS throughput, advanced RAID-6 protection and sub-millisecond I/O latency, the solution delivers 99.99% uptime, reduces datacenter rack space by 40% and lowers total cost of ownership through simplified storage management.
Real-Time Big Data Analytics and AI Workloads on HPE Smart Array P542D
A leading e-commerce enterprise runs an Apache Spark analytics cluster on XL270d Gen9 servers equipped with the 851508-B21 Smart Array P542D controller. Sustaining 500,000 IOPS across parallel read/write streams for 10 TB/day clickstream ingestion, it achieves sub-second query response and accelerates machine-learning model training. The outcome: 30% shorter ETL windows and 20% faster time-to-market for personalized customer experiences.
Resilient Edge Computing and Disaster Recovery for Remote Branch Offices
A retail chain equips 150 remote stores with XL270d Gen9 servers featuring the HPE Smart Array P542D to cache point-of-sale transactions with RAID-10 data resilience. Data replicas synchronize every 15 minutes to the central datacenter over WAN, ensuring zero transaction loss and under 2% branch downtime. Businesses gain continuous operations during network disruptions and enhanced data integrity for compliance audits.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 851508-B21 |  873373-B21 |  P9D91A |  451871-B21 |  H6G86A | |
|---|---|---|---|---|---|
| Product Type | Expansion Card | Expansion Card | Expansion Card | ||
| Card Type | Storage Controller | Storage Controller | Other | ||
| Interface | PCIe x8 | PCIe x4 | PCIe x8 | ||
| PCIe Version | PCIe 3.0 | PCIe 3.0 | PCIe 3.0 | ||
| Chipset / Controller | HPE Smart Array P542 Controller | HPE NVMe Controller | QLogic QMH2562 | ||
| Supported Ports | N/A | N/A | N/A | ||
| Port Count | N/A | N/A | 2 | ||
| Max Data Rate | N/A | N/A | N/A | ||
| RAID Levels Supported | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 / JBOD | N/A | N/A | ||
| Capture Resolution | N/A | N/A | N/A | ||
| Capture Frame Rate | N/A | N/A | N/A | ||
| Low Profile Bracket | Yes | No | Yes | ||
| Full Height Bracket | No | Yes | Yes | ||
| Cooling | Passive | Passive | Passive | ||
| Operating System Compatibility | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi | Windows / Linux | ||
| Bus Width | 64-bit | 64-bit | 64-bit | ||
| Power Requirements | 3.3V | 3.3V | 3.3V | ||
| Use Case | Storage Expansion | Storage Expansion | Storage Expansion | ||
| Product Name | 851508-B21-HPE Smart Array P542D - XL270d Gen9 Svr | 873373-B21-HPE Gen10 Purley NVMe FIO Setting | 451871-B21-HP BLc QLogic QMH2562 8Gb FC HBA Opt | ||
| Height | 1.73 inches | 1.0 inches | N/A | ||
| Width | 4.33 inches | 3.5 inches | N/A | ||
| Depth | 9.65 inches | 7.5 inches | N/A | ||
| Weight | 1.20 lbs | 0.5 lbs | N/A |
Reviews & Ratings
C
Christian Vogel
4
Cache handling improved disk responsiveness.
M
Matthew Lewis
5
Installed cleanly and worked immediately.
D
Diego Navarro
4
Reliable storage controller for XL270d.
A
Alan Brooks
5
Enterprise grade performance.
Questions & Answers
What is the HPE Smart Array P542D for XL270d Gen9 servers?
The HPE Smart Array P542D is a high-performance PCIe 3.0 RAID controller designed specifically for the HPE ProLiant XL270d Gen9 server, offering hardware-accelerated RAID, 12 Gb/s SAS and NVMe support, and advanced cache protection.
Which HPE ProLiant server models support the Smart Array P542D?
The Smart Array P542D is validated for HPE ProLiant XL270d Gen9 servers and select Gen9 blade enclosures; refer to HPE’s QuickSpecs for the complete compatibility matrix.
How many drives can the P542D controller manage?
The P542D supports up to 12 internal SAS or NVMe drives in the XL270d Gen9 chassis, enabling high-density storage configurations.
Which RAID levels are available on the Smart Array P542D?
It offers hardware-accelerated RAID levels 0, 1, 5, 6, 10, 50, and 60 to balance performance, capacity, and data protection.
Does the P542D support NVMe drives?
Yes, the P542D provides full NVMe support alongside 12 Gb/s SAS, allowing you to deploy mixed or all-NVMe arrays for ultra-low latency I/O.
What cache memory does the Smart Array P542D include?
It ships with 2 GB of HPE Flash-Backed Write Cache (FBWC) to accelerate write operations and protect data in the event of a power loss.
What interface and bus does the P542D use?
The controller uses a PCIe 3.0 x8 host interface and supports 12 Gb/s SAS lanes to deliver sustained throughput for demanding workloads.
Is hardware-based encryption supported on the P542D?
Yes, the P542D includes optional HPE Secure Encryption to safeguard data at rest with negligible performance impact.
Which operating systems are compatible with the P542D?
The P542D is supported under Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi, and other major enterprise OSes; check HPE’s support matrix for details.
How do I update the firmware on the Smart Array P542D?
Use the HPE Service Pack for ProLiant (SPP) or the HPE Smart Storage Administrator (SSA) to download and apply the latest P542D firmware securely.
What is the process for installing the P542D in an XL270d Gen9 server?
Insert the P542D into an available PCIe 3.0 x8 slot, connect drive backplane cables, power on the server, and configure arrays via the HPE Smart Storage Administrator utility.
How is the P542D configured and managed?
Administrators configure RAID arrays, monitor health, and update firmware using the HPE Smart Storage Administrator web interface or CLI, integrated into iLO for remote management.
Can I expand the P542D’s storage capacity after deployment?
Yes, you can add or replace drives within supported bays and use online capacity expansion to grow arrays without downtime.
What warranty and support options are available for the P542D?
The controller is covered by a one-year limited warranty, upgradeable to HPE Foundation Care or HPE Proactive Care for extended coverage and faster response times.
Where can I download drivers and management tools for the P542D?
Visit the HPE Support Center, enter SKU 851508-B21 or product name P542D, and download the latest drivers, firmware, and HPE Smart Storage Administrator packages.