Lenovo 4XH7A61128 SR635 2.5 Sas/sata 2BAY Rear BP X40 CBL

Lenovo 4XH7A61128 SR635 2-Bay Rear SAS/SATA Backplane Cable Kit

Overview

The Lenovo 4XH7A61128 is the factory-matched 2-bay rear backplane and cable assembly (X40 CBL) designed for the ThinkSystem SR635 server, supporting both SAS and SATA 2.5-inch drive configurations in the rear bay positions. If you are expanding storage density in an SR635 chassis — adding rear-facing drives for a tiered storage or caching layer — this is the Lenovo-specified component for that configuration. Because backplane cable kits are platform-specific, confirm the SR635 chassis revision against Lenovo's SR635 configurator before ordering; the wrong cable assembly will not connect cleanly to the mid-plane.

Key Features

• Dual Interface Support (SAS and SATA): The 4XH7A61128 supports both SAS and SATA protocols in the same backplane, giving you flexibility to install either SAS HDDs/SSDs for full enterprise reliability or SATA drives for higher-capacity, lower-cost storage — without swapping the backplane itself.
• 2-Bay Rear Configuration: Adds two rear-facing 2.5-inch drive slots to the SR635, which is useful for dedicated OS boot drives, hot-spare staging, or NVMe/SAS caching — keeping those drives separate from the primary storage bay and simplifying replacement workflows.
• Factory-Matched X40 Cable Assembly: The included X40 cable is routed and keyed specifically for the SR635 chassis geometry. Using a generic or third-party cable risks signal integrity issues at SAS speeds; the factory assembly eliminates that variable.
• Genuine Lenovo Component: Sourced as a factory-new Lenovo ThinkSystem spare/option. Server platform components sourced outside the authorized supply chain introduce firmware compatibility risks — this unit ships as genuine, ensuring full compatibility with Lenovo XClarity provisioning.

Integration & Compatibility

This backplane cable kit is designed for the Lenovo ThinkSystem SR635 server platform. It is classified under UNSPSC 43202105 (computer storage devices and media), consistent with its role as a drive-bay expansion component within the server storage components category. For full storage planning in SR635 deployments — including drive selection, RAID controller pairing, and hot-swap configuration — consult Lenovo's SR635 product guide and the storage capacity planning guide. If your deployment requires front-bay expansion rather than rear-bay, evaluate the appropriate front backplane option within the SR635 options catalog. For compatible PoE switches and network infrastructure supporting SR635-based surveillance recording servers, see the PoE switch category.

Frequently Asked Questions

Q: What server platform is the 4XH7A61128 designed for?

A: The 4XH7A61128 is designed for the Lenovo ThinkSystem SR635 server, specifically for the rear 2-bay 2.5-inch drive cage configuration.

Q: Does the 4XH7A61128 support both SAS and SATA drives?

A: Yes. The backplane supports both SAS and SATA interfaces, so you can install either SAS or SATA 2.5-inch drives in the rear bay slots.

Q: What does the X40 CBL designation mean?

A: X40 CBL refers to the cable assembly included with the backplane kit, factory-routed and keyed for the SR635 chassis to connect the rear backplane to the server mid-plane or controller.

Q: Can I use this backplane kit with servers other than the SR635?

A: This component is specified for the SR635. Lenovo backplane cable assemblies are platform-specific — physical fit and signal routing are chassis-dependent. Do not assume cross-compatibility with other ThinkSystem models without verifying against Lenovo's official configuration guide.

Q: Is the 4XH7A61128 a factory-new component?

A: Yes. The 4XH7A61128 ships factory-new as a genuine Lenovo ThinkSystem option/spare, sourced through the standard distribution channel.

James Everett

The 4XH7A61128 is a platform-matched rear backplane cable kit for the SR635 — the kind of component that looks interchangeable but isn't. The SAS/SATA dual-interface design is the right spec for environments that want to mix drive types in rear bays, but the critical detail is chassis specificity: this cable assembly is keyed for the SR635 geometry, and substituting a generic cable at SAS-3 speeds is a signal integrity risk you don't want to debug at 3 a.m.

Technical Highlights:

• SAS + SATA Dual Interface: One backplane supports both protocols — deploy SAS drives for write-intensive workloads or SATA for high-capacity archival, without a hardware swap.
• 2-Bay Rear Expansion: Rear-facing slots are the right place for OS boot drives or dedicated cache devices, keeping them isolated from primary storage bays and simplifying hot-swap procedures under load.
• X40 Factory Cable Routing: The included X40 cable assembly matches SR635 chassis routing precisely — eliminates the guesswork of third-party cable fitment and maintains signal integrity at the controller interface.

Deployment Considerations:

• Verify your SR635 chassis revision against Lenovo's configuration guide before ordering — backplane kits are revision-sensitive and a mismatch will require a return.
• At 10 lb shipping weight, this ships as a standard server component; handle the backplane PCB with ESD precautions during installation in the chassis.

The 4XH7A61128 is the correct call for SR635 deployments adding rear-bay drives for dedicated boot or caching — particularly in surveillance recording servers where separating OS and video storage onto physically distinct backplanes simplifies both maintenance and drive replacement workflows.