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P841 controller handles external SAS shelves effortlessly.
726903-B21
HP SMART ARRAY P841/4GB FBWC 12GB 4PORTS EXT SAS CONTROLLER
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726903-B21
- Description:
- HP SMART ARRAY P841/4GB FBWC 12GB 4PORTS EXT SAS CONTROLLER
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726903-B21 Overview
726903-B21-HP SMART ARRAY P841/4GB FBWC 12GB 4PORTS EXT SAS CONTROLLER is an enterprise-class storage controller expansion card engineered for high-performance server environments. Designed with advanced SAS connectivity, this RAID controller offers reliable data protection and management, featuring hardware RAID capabilities and support for multiple RAID levels to enhance storage efficiency and fault tolerance.
This card integrates a PCIe x8 interface operating on the PCIe 3.0 standard, leveraging the HP Smart Array P841 controller to deliver robust storage expansion and server enhancement solutions. Its 4-port external SAS configuration, passive cooling design, low-profile and full height bracket options, and broad OS compatibility—including Windows, Linux, VMware ESXi, and FreeBSD—make it ideal for mission-critical data environments.
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726903-B21 Specifications
- Product Type
- Expansion Card
- Card Type
- Storage Controller
- Interface
- PCIe x8
- PCIe Version
- PCIe 3.0
- Chipset / Controller
- HP Smart Array P841
- Supported Ports
- N/A
- Port Count
- 4
- Max Data Rate
- N/A
- RAID Levels Supported
- RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60
- Capture Resolution
- N/A
- Capture Frame Rate
- N/A
- Low Profile Bracket
- Yes
- Full Height Bracket
- Yes
- Cooling
- Passive
- Operating System Compatibility
- Windows / Linux / VMware ESXi / FreeBSD
- Bus Width
- 64-bit
- Power Requirements
- 3.3V
- Use Case
- Storage Expansion / Server Expansion
- Product Name
- 726903-B21-HP SMART ARRAY P841/4GB FBWC 12GB 4PORTS EXT SAS CONTROLLER
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
726903-B21 Use Case
Tier-1 Database Acceleration in Financial Services
In global financial services data centers, the 726903-B21 HP Smart Array P841/4GB FBWC 12Gb 4-port external SAS controller accelerates mission-critical Oracle OLTP and Microsoft SQL Server workloads. By delivering sub-millisecond latency and 4× higher IOPS, it ensures continuous trading operations, strict SLA adherence and real-time analytics capabilities.
Scalable Virtualization and VDI Performance Optimization
In enterprise virtual desktop infrastructure (VDI) clusters supporting over 2,500 sessions, the 726903-B21 HP Smart Array P841 leverages 12Gb SAS channels and 4GB Flash-Backed Write Cache to expedite VM boot storms and I/O-intensive applications. The result is a 45% reduction in boot times, a 50% increase in VM density per server and a lowered TCO through optimized hardware utilization.
High-Speed Backup & Disaster Recovery Data Protection
In hybrid IT environments requiring robust backup and disaster recovery, the 726903-B21 HP Smart Array P841’s four external SAS ports interface with tape libraries, disk backup appliances and remote JBOD enclosures. This configuration doubles backup throughput, maintains data integrity with Flash-Backed Write Cache and meets aggressive RPO/RTO objectives for critical business continuity.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 726903-B21 |  804405-B21 |  820834-B21 |  726821-B21 |  726907-B21 | |
|---|---|---|---|---|---|
| Product Type | Expansion Card | Expansion Card | Expansion Card | Expansion Card | |
| Card Type | Storage Controller | Storage Controller | RAID Controller | Storage Controller | |
| Interface | PCIe x8 | PCIe x8 | PCIe x8 | PCIe x8 | |
| PCIe Version | PCIe 3.0 | PCIe 3.0 | PCIe 3.0 | N/A | |
| Chipset / Controller | HP Smart Array P841 | HPE Smart Array | HPE Smart Array P440 | HP Smart Array P440 | |
| Supported Ports | N/A | N/A | N/A | N/A | |
| Port Count | 4 | 8 | 1 | 1 | |
| 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 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | |
| Capture Resolution | N/A | N/A | N/A | N/A | |
| Capture Frame Rate | N/A | N/A | N/A | N/A | |
| Low Profile Bracket | Yes | Yes | Yes | Yes | |
| Full Height Bracket | Yes | No | Yes | Yes | |
| Cooling | Passive | Passive | Passive | Passive | |
| Operating System Compatibility | Windows / Linux / VMware ESXi / FreeBSD | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi | Windows / Linux / VMware ESXi | |
| Bus Width | 64-bit | 64-bit | 64-bit | 64-bit | |
| Power Requirements | 3.3V | 3.3V | 3.3V | 3.3V | |
| Use Case | Storage Expansion / Server Expansion | Storage Expansion | Storage Expansion | Storage Expansion | |
| Product Name | 726903-B21-HP SMART ARRAY P841/4GB FBWC 12GB 4PORTS EXT SAS CONTROLLER | 804405-B21-SMART ARRAY P408E-P SR GEN10 CTRLR PL=SI | 820834-B21-HPE Smart Array P440/2GB FBWC 12Gb 1-port Int SAS Controller | 726821-B21-HP SMART ARRAY P440/4GB FBWC 12GB 1PORT INT SAS CONTROLLER | |
| Height | N/A | 1.2 inches | N/A | 1.5 inches | |
| Width | N/A | 8.0 inches | N/A | 4.7 inches | |
| Depth | N/A | 10.0 inches | N/A | 7.9 inches | |
| Weight | N/A | 2.5 lbs | N/A | 1.2 lbs |
Reviews & Ratings
M
Maha Ali
4
Strong RAID performance and cache reliability.
F
Frank Weber
5
Excellent controller for large storage arrays.
I
Irfan Siddiqui
3
No bottlenecks observed in production.
A
Angela Morris
4
Enterprise-grade Smart Array controller.
Questions & Answers
What is the HP Smart Array P841/4GB FBWC 12GB 4-ports external SAS controller?
The HP Smart Array P841 is a hardware RAID controller with 4 GB of flash-backed write cache (FBWC) and four external 12 Gb/s SAS ports, designed for enterprise servers to deliver high-throughput, low-latency storage connectivity.
Which RAID levels does the P841 controller support?
The P841 supports RAID levels 0, 1, 5, 6, 10, 50 and 60, allowing flexible configurations for performance, capacity and redundancy.
How many external SAS drives can I connect to this controller?
With four external 12 Gb/s SAS ports, the P841 can connect up to 256 SAS or SATA drives using appropriate expanders.
What is FBWC and why is it important?
Flash-backed write cache (FBWC) uses supercapacitors and non-volatile flash to protect cached data during power loss, ensuring safe write operations and quick recovery.