Release Notes for Cisco UCS X9508 Chassis Firmware, Release 6.0
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Cisco UCS X9508 Chassis Firmware, Release 6.0
The Cisco UCS X-Series Modular System is built around the Cisco UCS X9508 Chassis, which is engineered to be adaptable and future-ready. It is a standard, open system designed for rapid deployment and automation, seamlessly integrating with hybrid cloud environments.
Featuring a midplane-free architecture, the X9508 chassis achieves I/O connectivity through front-loading, vertically oriented compute nodes that intersect with horizontally oriented I/O connectivity modules at the rear of the chassis. Unified Ethernet fabric is provided via Cisco UCS 9108 Intelligent Fabric Modules. Cisco UCS X-Fabric Technology enables connectivity between compute nodes and resource nodes (such as GPU accelerators) using PCIe Gen5 and will support additional industry-standard protocols as they emerge. Interconnections can be easily updated by installing new modules.
This 7-rack-unit (7RU) chassis offers eight front-facing flexible slots that can accommodate a combination of compute nodes and a pool of future I/O resources, such as disk storage and nonvolatile memory.
For more information, see the Cisco UCS X9508 Chassis Spec Sheet.
For information about installing or upgrading Cisco UCS X9508 Chassis, see the Cisco UCS X9508 Server Chassis Installation Guide.
Note:
● The X9508 Chassis firmware images and the X580p PCIe Node firmware images are available as separate bundles.
● The Cisco UCS X9508 chassis firmware bundle contains images for the X-Fabric Modules (XFMs) and Power Supply Units (PSUs).
Revision history
| Date |
Description |
| December 18, 2025 |
Updated release notes for X9508 Chassis Firmware, Release 6.0(1.252050). |
| December 11, 2025 |
Created release notes for X9508 Chassis Firmware, Release 6.0(1.252044). |
New hardware in release 6.0.1.252050
No new hardware is introduced in this release.
New hardware in release 6.0.1.252044
● Support for Cisco UCS X580p PCIe Node
For detailed information on Cisco UCS X580p PCIe Node, see Release Notes for Cisco UCS X580p PCIe Node Firmware, Release 6.0.
● Support for Cisco UCS X9516 X-Fabric Module
The Cisco UCS X9516 X-Fabric is the second-generation X-Fabric module for the UCS X9508 chassis. It provides ultra-low-latency PCIe Gen5 switching and SmartNIC support, enabling flexible and composable IT resources. Managed via Cisco Intersight®, the UCS X9516 X-Fabric allows GPUs and NICs to be dynamically provisioned across servers using policy-based management.
Paired with the UCS X580p PCIe Node, the X9516 X-Fabric supports up to four dual-slot GPUs per node with NVLink Bridge support, serving as the control point for modular GPU composability in AI-driven environments.
Note: The Cisco UCS X9516 X-Fabric Module is compatible only with the Cisco UCS X580p PCIe Node.
For more information, see Cisco UCS X9516 X-Fabric Module Data Sheet.
Minimum firmware requirements for support of X9516 X-Fabric module
◦ Cisco UCS X9508 chassis firmware: 6.0(1.252044)
◦ Cisco UCS X580p PCIe node firmware: 6.0(1.252044)
◦ Cisco UCS X-series M8 server firmware: 6.0(1.252039)
◦ Fabric Interconnect infrastructure firmware: 6.0(1.250229)
Resolved issues in release 6.0(1.252050)
There are no resolved issues in this release.
Resolved issues in release 6.0(1.252044)
There are no resolved issues in this release.
Open issues in release 6.0(1.252050)
There are no open issues in this release.
Open issues in release 6.0(1.252044)
This section provides a brief description of the open issues.
| Bug ID |
Description |
Workaround |
First version affected |
| CSCwr31737 |
On Cisco UCSX-9508 chassis configured with a Cisco UCS X580p PCIe Node, changing from a higher to a lower available power policy can cause one or more servers or GPUs to receive insufficient or no power. This may result in affected servers or GPUs shutting down, or the system becoming oversubscribed and at risk of a chassis brownout. Additionally, GPUs may continue to stay 'On' even when power is not allocated to the paired Cisco UCS X-Series server or the GPU server. This can lead to inaccurate status reporting and potential operational issues. |
Do not change the power policy from a higher available power setting to a lower one. If the policy is changed accidentally, revert to the original setting.
|
6.0(1.250229)
|
Release bundle contents
Note: The Cisco UCS X9508 Chassis firmware is available as a separate bundle.
Cisco UCS X9508 chassis firmware bundle for 6.0(1.252050)
The Cisco UCS X9508 chassis firmware bundle 6.0(1.252050) contains images for the Cisco UCS X9516 X-Fabric Module and Power Supply Units (PSUs), along with the following images:
| Component |
Packaged version |
| Board_Controller |
3.0 |
| CIMC |
6.0(1.252050) |
| PSX |
2.010 |
| Device Connector |
1.0.11-20251004130616137 |
| UCSX-PSU-2800AC |
2.6,2.9 |
Cisco UCS X9508 chassis firmware bundle for 6.0(1.252044)
The Cisco UCS X9508 chassis firmware bundle 6.0(1.252044) contains images for the Cisco UCS X9516 X-Fabric Module and Power Supply Units (PSUs), along with the following images:
| Component |
Packaged version |
| Board_Controller |
3.0 |
| CIMC |
6.0(1.252044) |
| PSX |
2.010 |
| Device Connector |
1.0.11-20251004130616137 |
| UCSX-PSU-2800AC |
2.6,2.9 |
● Release Notes for Cisco UCS X580p PCIe Node Firmware, Release 6.0
● Release Notes for Cisco Intersight Managed Mode Infrastructure Firmware, Release 6.0
● Release Notes for Cisco Intersight Managed Mode Server Firmware, Release 6.0
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