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Broadcom MegaRAID

# Broadcom MegaRAID

Overview

Broadcom MegaRAID is a family of hardware RAID controllers renowned for their reliability, performance, and feature set, making them a staple in Dedicated Servers and enterprise storage solutions. Formerly owned by LSI and Avago, now under Broadcom, these controllers offer a wide range of capabilities, from simple RAID levels like 0, 1, and 5 to more advanced options like RAID 6, RAID 10, and RAID 60. The core function of a MegaRAID controller is to manage and protect data across multiple physical hard drives or SSD Storage devices, presenting them to the operating system as a single logical unit. This results in improved data redundancy, increased performance (depending on RAID level), and simplified storage management.

The significance of using a hardware RAID controller like Broadcom MegaRAID, rather than software RAID implemented by the operating system, lies in its dedicated processing power. MegaRAID controllers have their own dedicated processors and memory, offloading the RAID calculations from the main CPU Architecture of the server. This frees up valuable CPU cycles for other tasks, leading to overall system performance gains. Furthermore, hardware RAID generally provides better data protection and recovery capabilities.

Broadcom MegaRAID controllers are available in various form factors, including PCIe cards and embedded solutions, to cater to different server configurations and needs. They support a wide array of interfaces, including SAS (Serial Attached SCSI) and SATA (Serial ATA), allowing for flexibility in drive selection. Modern MegaRAID controllers also incorporate features like cache protection with optional battery backup units (BBUs) or flash-based cache modules (FBWC) to ensure data integrity in the event of a power failure. Understanding the intricacies of Broadcom MegaRAID is crucial for anyone involved in Server Administration or building high-performance storage systems. This article will delve into the specifications, use cases, performance characteristics, and pros & cons of utilizing Broadcom MegaRAID in a server environment.

Specifications

Broadcom MegaRAID controllers come in varying models, each with its own unique set of specifications. Here's a breakdown of common specifications found across different MegaRAID series:

Model Controller Type Max Drives Supported RAID Levels Supported Cache Memory Interface PCIe Interface
MegaRAID SAS 9300-8i 8-Port SAS/SATA 8 RAID 0, 1, 5, 6, 10, 50, 60 8GB DDR4 SAS 3.0 / SATA 3.0 PCIe 3.0 x8
MegaRAID SAS 9460-8i 8-Port SAS/SATA 8 RAID 0, 1, 5, 6, 10, 50, 60 16GB DDR4 SAS 3.0 / SATA 3.0 PCIe 4.0 x8
MegaRAID SAS 9660-8i 8-Port SAS/SATA 8 RAID 0, 1, 5, 6, 10, 50, 60 32GB DDR4 SAS 3.0 / SATA 3.0 PCIe 4.0 x8
MegaRAID LSI 08 Embedded SAS/SATA Up to 24 (depending on motherboard) RAID 0, 1, 5, 6, 10 2GB DDR3 SAS 2.0 / SATA 3.0 PCIe 2.0 x8

The table above showcases a few popular Broadcom MegaRAID models. Key specifications to consider include the number of drives supported, the RAID levels supported, the amount of cache memory, the interface types (SAS and SATA), and the PCIe interface version. Newer models, like the 9460 and 9660 series, benefit from the increased bandwidth offered by PCIe 4.0. The amount of cache memory significantly impacts performance, especially for write-intensive workloads. Choosing the right MegaRAID controller depends on the specific requirements of the server and the intended application. Consider factors like drive capacity, performance needs, and budget. It's also important to check the Hardware Compatibility List (HCL) of your server to ensure compatibility with the chosen MegaRAID controller.

Use Cases

Broadcom MegaRAID controllers are utilized in a broad spectrum of server applications due to their versatility and robustness. Here are some common use cases:

⚠️ *Note: All benchmark scores are approximate and may vary based on configuration. Server availability subject to stock.* ⚠️

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