HP 655636-B21 PCI-E Controller Card
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HP 655636-B21 Smart Array P721m/512MB FBWC 6GBPS 4-ports SAS Bulk

Availability: In Stock
Part Number#: 655636-B21
List Price was: $511.63
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New Bulk Pack

Short Description:
655636-B21 Smart Array P721m/512 Megabytes(MB) Flash Backed Write Cache (FBWC) 6 Gigabytes Per Second (GBPS) 4-Ports Ext Peripheral Component Interconnect Express (PCI-E) 3.0 SAS/SATA Storage (RAID) Controller for ProLiant Generation8 Servers | Made by HP | New Bulk Pack
Product Condition:
New Bulk Pack
Warranty provided by ALLHDD.COM:
90 Days

Key Features and Benefits of the P721m Controller

  • Advanced RAID Support: The HP Smart Array P721m provides advanced RAID support including RAID levels 0, 1, 5, 6, 10, 50, and 60, ensuring data protection and performance optimization.
  • High-Performance Cache: The controller features a 512MB flash-backed write cache (FBWC), providing fast and reliable write performance. The FBWC provides protection against data loss in the event of a power failure.
  • SAS Connectivity: The P721m features four internal SAS ports, providing high-speed connectivity to SAS and SATA drives. The SAS ports support data transfer rates of up to 6Gbps, providing fast and reliable performance.
  • Scalable Storage: The P721m supports up to 16 physical drives, allowing for scalable storage solutions to meet the needs of growing businesses.
  • Easy Management: The P721m is managed through the HP Smart Storage Administrator (SSA), providing a simple and intuitive interface for storage management and configuration.
  • Server Integration: The P721m is designed for seamless integration into HP ProLiant servers, providing a flexible and scalable storage solution for HP ProLiant customers.
  • Improved Data Availability: The P721m supports online drive firmware updates, allowing for maintenance and upgrades without disrupting system operations. The controller also supports hot-swappable drives, allowing for drive replacement without shutting down the system.
  • Enhanced Reliability: The P721m features advanced error recovery technology, providing improved data protection and reduced downtime. The controller also supports advanced drive protection features, such as proactive drive failure prediction and automatic rebuild of failed drives.

Performance Optimization and Scalability

  • Cache Memory: The HP Smart Array P721m/512MB FBWC 6GBPS 4-ports SAS Controller (655636-B21) has a 512 MB flash-backed write cache (FBWC) which can significantly improve the performance of the controller.
  • SAS Connectivity: The 4-ports SAS connectivity provides fast data transfer rates of up to 6Gbps, allowing for scalable performance as your storage needs grow.
  • RAID Configuration: By configuring the controller in a RAID configuration, you can maximize the performance and increase the data protection of your storage system.
  • Multiple Logical Drives: The controller supports the creation of multiple logical drives, which can be used to allocate resources for different applications and improve performance.
  • Load Balancing: The controller provides load balancing capabilities, which can help to distribute the load evenly across multiple disks, improving performance and reducing the risk of disk failure.
  • Expansion: The controller supports expansion through external storage enclosures, allowing you to add more storage capacity to your system as your storage needs grow.
  • Dynamic Provisioning: The controller supports dynamic provisioning, which allows you to allocate storage on demand, improving the scalability of your storage system.

It is recommended to consult with HP or a storage professional to determine the best performance optimization and scalability strategy for your specific use case and storage requirements.

Operating System Compatibility

The HP Smart Array P721m/512MB FBWC 6Gbps 4-ports SAS Controller (655636-B21) is compatible with the following operating systems:

  • Windows Server: Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016
  • Red Hat Enterprise Linux (RHEL): RHEL 5, RHEL 6, RHEL 7
  • SUSE Linux Enterprise Server (SLES): SLES 11, SLES 12
  • VMware ESXi: ESXi 5.0, ESXi 5.1, ESXi 5.5, ESXi 6.0, ESXi 6.5
  • HP-UX: HP-UX 11i v3
  • Oracle Solaris: Solaris 11
  • Citrix XenServer: XenServer 6.0, XenServer 6.1, XenServer 6.2, XenServer 6.5

It is recommended to check with HP for the latest operating system compatibility information and to ensure compatibility with your specific hardware configuration.

General Information about this HP 655636-B21

  • Manufacturer: HP
  • Part Number or SKU# 655636-B21
  • Type: Controller Card
  • Interface: SAS Controller

Technical Information of Smart Array Controller

  • Device Type: Storage Controller (RAID) - Plug-in Card
  • Host Bus: PCI-E 3.0
  • Features: Flash Backed Write Cache (FBWC)

Networking Information for SAS 6GBPS Controller

  • Interface: SATA 6Gb/s / SAS 6Gb/s
  • Data Transfer Rate: 600MBps
  • Buffer Size: 512Mb
  • Supported Devices: Disk Array (RAID), Hard Drive
  • RAID Level: RAID 0, RAID 1

Expansion & Connectivity

  • Interfaces: 4 x SATA 6Gb/s / SAS 6Gb/s (internal)
  • Compatible Slots: 1 x PCI Express 3.0

Contact us or ask for live chat/help if you have any questions about the compatibility of this item to ensure the model's matching features with your current system.

Product Condition:
New Bulk Pack
Warranty provided by ALLHDD.COM:
90 Days

About New Bulk Pack Products

New Bulk Pack products come with clamshell boxes and do not have any manufacturer warranty. Many times manufacturers disassemble whole units to use parts or pulled from a new system. Typically, this product doesn't come with software or instructions unless indicated and no Manufacturer’s genuine warranty. You can take note these are not brand new products.


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ALLHDD guarantees that the products will not have defects in material that will affect the product's functionality during the Standard Warranty Period. The warranty period starts when the merchandise/items from our warehouse.

What does ALLHDD.Com warranty cover?

30-days to 3 years warranty:

Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

What is not covered by our warranty?

The reason why our warranty does not cover any problem caused by the following conditions:

(a) misuse of hardware; accidental damage; carelessness product(s) damage; shock; temperature beyond the specification of any product; faulty installation; operation; modification of goods;

(b) any misuse outside the instructions in the user manual for any specific product;

(c) damaged caused by other hardware or equipment. The warranty will void if the item is returned with physical damage, damage to the retail box, removed from the box, counterfeit labels/labelled by them, or any modifications of internal and external covers. Data loss or damages to any other equipment we do not cover by our offered warranty.

What is the Manufacturer/Brand Warranty?

In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

For the server parts (i.e., Dell, HPE) to get Full coverage of the warranty server must have a full 3- 5 years warranty. However, ALLHDD.COM will cover the warranty duration if any Manufacturer doesn't support the advertised warranty and there is no refund for those.
Final Sale items are non-returnable/refundable in any situation. Any question? please ask our team before the shipment.

Important notes:

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Shipping Options and Estimated Delivery Time

UPS Shipping Options:

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Estimated delivery time: 4-7 business days

UPS 3 Day Select®
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UPS Next Day Air® First Overnight - Early A.M
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UPS® First Overnight - Saturday
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FedEx Shipping Options:

FedEx Ground®
Estimated delivery time: (4–7 business days in the contiguous 48 states)
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Estimated delivery time: 4−7 business days, based on the distance to the destination.

FedEx Express Saver®
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Available throughout all 50 states (except Hawaii and Alaska)

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Available throughout all 50 states

FedEx Standard Overnight®
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Available throughout all 50 states (Hawaii is outbound only)

FedEx Priority Overnight®
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Available throughout all 50 states

FedEx First Overnight®
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Worldwide Shipping Options:

UPS®/FedEx® International Economy

Estimated delivery time: 4-7 business days

UPS®/FedEx® International Priority

Estimated delivery time: 2-4 business days

UPS®/FedEx® Ground Shipping Canada

Estimated delivery time: 5-8 business days

Important notes:

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