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Henry Adams
5
Smart Array controller handled SAS workloads smoothly.
843199-B21
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HP SMART ARRAY P840AR/2GB FBWC 12GB 2PORT INTERNAL SAS CONTR...
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843199-B21
- Description:
- HP SMART ARRAY P840AR/2GB FBWC 12GB 2PORT INTERNAL SAS CONTROLLER
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843199-B21 Overview
843199-B21-HP SMART ARRAY P840AR/2GB FBWC 12GB 2PORT INTERNAL SAS CONTROLLER is a high-performance internal RAID controller designed to deliver robust storage expansion and data protection for enterprise servers. Engineered as a dedicated storage controller, it features a dual-port internal SAS connection, a sizable 12GB cache paired with 2GB FBWC for improved write performance, and hardware RAID support for enhanced reliability under heavy I/O operations.
This expansion card is built for seamless server enhancement with broad operating system compatibility including Windows, Linux, and VMware ESXi. It is intended for use cases such as storage expansion in data centers and high-demand server environments, and comes equipped with a full height bracket and passive cooling to ensure stable operation under continuous workloads.
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843199-B21 Specifications
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- PCIe Version
- N/A
- Product Type
- Expansion Card
- Interface
- PCIe x8
- Supported Ports
- N/A
- Port Count
- 2
- Max Data Rate
- N/A
- Capture Resolution
- N/A
- Capture Frame Rate
- N/A
- Full Height Bracket
- Yes
- Cooling
- Passive
- Bus Width
- 64-bit
- Power Requirements
- 3.3V
- Use Case
- Storage Expansion
- Card Type
- Storage Controller
- Low Profile Bracket
- No
- Operating System Compatibility
- Windows / Linux / VMware ESXi
- RAID Levels Supported
- RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60
- Chipset / Controller
- HP Smart Array P840
- Product Name
- 843199-B21-HP SMART ARRAY P840AR/2GB FBWC 12GB 2PORT INTERNAL SAS CONTROLLER
843199-B21 Use Case
Virtualization Acceleration with 843199-B21 HP Smart Array P840ar
In a large enterprise data center running 500+ VMware ESXi hosts on HP ProLiant DL380 Gen10 servers, the 843199-B21 HP Smart Array P840ar/2GB FBWC 12Gb 2-port internal SAS controller enables low-latency RAID 10 across SAS SSD arrays. This configuration delivers up to 40% faster VM boot times, boosts consolidation ratios by 30%, and ensures predictable I/O performance with battery-free write cache protection and built-in data integrity features.
Accelerated OLTP Database Performance for Financial Services
A global brokerage firm deploying Microsoft SQL Server for high-volume trading relies on the 843199-B21 HP Smart Array P840ar/2GB FBWC 12Gb 2-port internal SAS controller to optimize write-intensive workloads. By configuring RAID 1/10 across enterprise SAS SSDs, the controller reduces transaction latency by 20%, sustains 99.9% availability during peak trading hours, and accelerates end-of-day reconciliation, ensuring regulatory SLAs are consistently met.
Hyper-Converged Infrastructure with VMware vSAN Resiliency
An enterprise IT team building a hyper-converged cluster on HP ProLiant Gen10 servers integrates the 843199-B21 HP Smart Array P840ar/2GB FBWC 12Gb 2-port internal SAS controller as the caching and capacity tier for VMware vSAN. This delivers 3× faster storage rebuilds after disk failures, improves read/write throughput by 50%, and simplifies capacity scaling—all while maintaining enterprise-grade data protection and inline error correction.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 843199-B21 |  726903-B21 |  866723-B21 |  874576-B21 |  726757-B21 | |
|---|---|---|---|---|---|
| Product Type | Expansion Card | Expansion Card | Expansion Card | Expansion Card | |
| Card Type | Storage Controller | Storage Controller | Storage Controller | Storage Controller | |
| Interface | PCIe x8 | PCIe x8 | PCIe x4 | N/A | |
| PCIe Version | N/A | PCIe 3.0 | PCIe 3.0 | N/A | |
| Chipset / Controller | HP Smart Array P840 | HP Smart Array P841 | N/A | N/A | |
| Supported Ports | N/A | N/A | N/A | N/A | |
| Port Count | 2 | 4 | N/A | 2 | |
| Max Data Rate | N/A | N/A | N/A | N/A | |
| RAID Levels Supported | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 | N/A | N/A | |
| Capture Resolution | N/A | N/A | N/A | N/A | |
| Capture Frame Rate | N/A | N/A | N/A | N/A | |
| Low Profile Bracket | No | Yes | Yes | No | |
| Full Height Bracket | Yes | Yes | Yes | No | |
| Cooling | Passive | Passive | Passive | Passive | |
| Operating System Compatibility | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi / FreeBSD | Windows / Linux / VMware ESXi | N/A | |
| Bus Width | 64-bit | 64-bit | 64-bit | N/A | |
| Power Requirements | 3.3V | 3.3V | 3.3V | N/A | |
| Use Case | Storage Expansion | Storage Expansion / Server Expansion | Storage Expansion | Storage Expansion | |
| Product Name | 843199-B21-HP SMART ARRAY P840AR/2GB FBWC 12GB 2PORT INTERNAL SAS CONTROLLER | 726903-B21-HP SMART ARRAY P841/4GB FBWC 12GB 4PORTS EXT SAS CONTROLLER | 866723-B21-HPE XL230k NVMe Enablement FIO Kit | 874576-B21-HPE ML350 Gen10 12Gb SAS Expander Kit | |
| Height | N/A | N/A | N/A | N/A | |
| Width | N/A | N/A | N/A | N/A | |
| Depth | N/A | N/A | N/A | N/A | |
| Weight | N/A | N/A | N/A | N/A |
Reviews & Ratings
W
Waqas Ahmed
5
Stable RAID performance under load.
L
Leonardo Costa
4
OEM controller ensured compatibility.
R
Rene Poulsen
5
Reliable enterprise storage controller.
M
Mudassir Khan
5
No issues in production.
Questions & Answers
What is the HP Smart Array P840ar/2GB FBWC 12Gb 2-Port Internal SAS Controller (SKU: 843199-B21)?
The HP Smart Array P840ar is an internal SAS RAID controller with two 12 Gb/s ports and 2 GB flash-backed write cache (FBWC) designed for high-performance enterprise storage.
Which RAID levels does the P840ar controller support?
The P840ar supports RAID 0, 1, 5, 6, 10, 50 and 60, enabling flexible data protection and performance tuning for a wide range of workloads.
How many and what type of ports does the P840ar have?
The controller includes two internal SAS ports, each delivering up to 12 Gb/s for direct-attach disk enclosures or backplanes.
What is FBWC and how does it benefit performance?
Flash-backed write cache (FBWC) uses a supercapacitor to preserve cached data in the event of power loss, ensuring write performance without sacrificing data integrity.
What operating systems are compatible with the Smart Array P840ar?
The P840ar is certified for major server OS platforms including Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server and VMware ESXi.
Which HP ProLiant servers support the P840ar controller?
This controller is compatible with HP ProLiant Gen9 and Gen10 servers, such as the DL380, DL360, ML350 and BL460 series.
How do I install the P840ar controller in my server?
Power down the server, insert the controller into a free PCIe Gen3 slot, secure it with the retention bracket, reconnect cables and power on for firmware initialization.
How can I update the firmware on the P840ar?
Use the HP Smart Update Manager (SUM) or HPE Service Pack for ProLiant (SPP) to download and apply the latest firmware package for automated, reliable updates.
What is the drive cache memory capacity on this controller?
The P840ar includes 2 GB of FBWC, which accelerates write operations and boosts overall I/O throughput.
Does the P840ar include battery backup for its cache?
The controller uses a flash-backed write cache mechanism instead of a conventional battery, reducing maintenance and ensuring data persistence.
What peak sequential I/O performance can I expect?
With two 12 Gb/s ports and 2 GB FBWC, the P840ar can deliver up to 1.5 GB/s sequential read/write throughput under optimal conditions.
How do I configure logical drives on the P840ar?
Enter the HPE Smart Storage Administrator (SSA) during POST, create and assign logical drives, set RAID levels and initialize the array with guided wizards.
Can I mix SAS and SATA drives with this controller?
Yes, the P840ar supports both SAS and SATA drives, allowing mixed-drive configurations within the same enclosure for flexibility.
What form factor and slot type does the P840ar require?
The P840ar is a full-height, full-length PCIe 3.0 x8 card designed for standard server chassis with available PCIe Gen3 slots.
What warranty and support options are available for SKU 843199-B21?
HPE backs this controller with a standard three-year limited warranty plus optional HPE Care Pack services for hardware replacement and 24/7 support.
How do I monitor the health and status of the P840ar?
Use HPE Integrated Lights-Out (iLO) or the Smart Storage Administrator to view real-time metrics, alerts and predictive failure analysis for your array.