Lenovo ThinkSystem RAID 540-8i PCIe Gen4 12Gb Adapter

Overview

The Lenovo 4Y37A78834 is a RAID adapter designed to connect SAS and SATA drives through a PCIe 4.0 x8 interface, delivering 12 Gbps connectivity for both drive types. Built on the Broadcom MegaRAID 9540 chipset, this cacheless adapter supports RAID 0, RAID 1, RAID 10, and JBOD configurations, making it a practical choice for small to medium businesses that need flexible storage options with cost-effective data protection. It can manage up to 63 physical drives with a SAS expander and supports up to 32 virtual drives, providing scalability for growing storage demands.

Key features

• PCIe 4.0 x8 interface ensures fast data transfer rates and compatibility with modern servers
• Supports RAID 0, 1, 10, and JBOD modes to balance performance, redundancy, and direct disk access
• Cacheless design reduces complexity and overhead, simplifying management and improving reliability
• Ability to mix SAS and SATA drives in separate arrays allows reuse of existing disks alongside new additions
• Supports 512e, 512n, and 4K sector formats, ensuring compatibility with a wide range of drives
• UNMAP and TRIM command support optimizes SSD performance and longevity
• Compatible with major operating systems including Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, and VMware ESXi
• Fixed 64 KB stripe size simplifies configuration and maintains consistent performance

Key specs

• Host interface: PCIe 4.0 x8
• Drive interface: 12 Gbps SAS and SATA
• RAID levels supported: 0, 1, 10, JBOD
• Chipset: Broadcom MegaRAID 9540
• Maximum physical drives: 63 (with SAS expander)
• Maximum virtual drives: 32
• Stripe size: fixed 64 KB
• Supported sector formats: 512e, 512n, 4K
• Operating system compatibility: Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi

Connectivity and compatibility

This RAID adapter connects via a PCIe 4.0 x8 slot, providing high bandwidth for demanding storage tasks. It supports both 12 Gbps and 6 Gbps SAS and SATA drives, allowing integration with a variety of existing hardware. The ability to manage up to 63 physical drives through a SAS expander makes it suitable for expanding storage arrays without replacing the controller. Its broad OS compatibility ensures it fits well into diverse IT environments running Windows, Linux, or VMware platforms.

Ideal uses and environments

This adapter is well suited to small and medium businesses that require reliable RAID protection without the complexity of cache management. It works effectively in virtualization hosts running ESXi or Linux, where RAID 10 offers a balance of performance and resilience. For file or application servers needing simple redundancy, RAID 1 provides mirrored protection. RAID 0 is available for workloads that prioritize speed over redundancy, while JBOD mode supports software-defined storage or backup solutions that require direct disk access. Its flexibility in mixing SAS and SATA drives helps organizations optimize costs by reusing existing drives alongside new capacity.