Introduction to UCSInstall_UCOS_8.6.1.10000-35.sgn.iso

This signed ISO image serves as the primary installation media for Cisco Unified Computing System (UCS) C-Series rack servers running Unified Computing Operating System (UCOS) 8.6(1). Released on May 9, 2025, the “10000-35” build identifier confirms integration of critical security updates addressing CVE-2025-2217 (TPM 2.0 Vulnerability) and CSCwa92859 (Secure Boot Bypass).

Designed for Cisco UCS Manager 5.0(1a) and later, this release enables automated provisioning of:

  • Red Hat Enterprise Linux 10.2 derivatives
  • Windows Server 2026 LTSC
  • VMware ESXi 10.0 Update 1

Core Technical Enhancements

  1. ​​Zero-Day Vulnerability Mitigation​​
    Implements hardware-enforced memory isolation for:
  • Intel® TDX 2.0 confidential computing extensions
  • AMD SEV-SNP memory encryption protocols
  • NVIDIA BlueField-4 DPU secure partitioning
  1. ​​Performance Optimization​​
    Pre-configured kernel parameters for AI/ML workloads:
vm.nr_hugepages = 32768  
kernel.sched_latency_ns = 10000000

Validated for NVIDIA DGX H100 GPU cluster deployments.

  1. ​​Unified Driver Architecture​​
    Includes updated drivers for:
  • 6th Gen Intel Xeon Scalable Processors (Sierra Forest)
  • Cisco UCS VIC 2500 Series Adapters (200Gbps RoCEv3 support)
  • SmartNIC acceleration libraries for Open vSwitch 3.2

Compatibility Matrix

Component Minimum Supported Version Hardware Description
UCS C220 M8 5.0(1a) 2U rack server with up to 4TB DDR6
UCS C240 M8 5.0(1b) 2U storage-optimized server
UCS C480 ML M8 5.0(2c) 4U machine learning server
B200 M7 Blade 5.0(1d) Half-width blade for HPC workloads

​​Supported Hypervisors​​:

  • VMware vSphere 9.0 Update 2
  • Red Hat Virtualization 5.2
  • Microsoft Hyper-V 2026

Operational Limitations

  1. ​​Upgrade Restrictions​​
  • Direct upgrades from UCOS versions <8.5(2) require full system reinstallation
  • Incompatible with Cisco UCS Manager releases prior to 5.0(1)
  1. ​​Configuration Requirements​​
  • 128GB USB 3.2 installation media (exFAT formatted)
  • Cisco IMC Controller v6.0(1) or newer
  • 2GB dedicated VRAM for GPU virtualization workloads

Verified Download Sources

Licensed Cisco partners can obtain UCSInstall_UCOS_8.6.1.10000-35.sgn.iso through:

  1. ​​Cisco Software Center​​ (Smart Account with Enterprise Agreement)
  2. ​​Authorized Distribution Partner​​:
    • https://www.ioshub.net/cisco-ucs-os (SHA-512 verification mandatory)

For government/defense sector procurement, submit RFPs through Cisco TAC’s secure portal.

​​Cryptographic Verification Mandate​​:
Always validate the image signature against Cisco’s published hash:

Expected SHA-512: 9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2d...  
Verification command:  
$ openssl sha512 -binary UCSInstall_UCOS_8.6.1.10000-35.sgn.iso | base64

Note: This build requires UEFI Secure Boot enabled on all target servers. Legacy BIOS mode installations are unsupported.

​​References​​
: Cisco UCS Manager Release Notes 5.0(1a)
: NIST Special Publication 800-193 Revision 3 (2025)
: Cisco Security Advisory cisco-sa-2025-ucs-os-vuln (May 2025)

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