​​Introduction to UCS_UCOS_UNRST_9.0.1.10000-37.iso​​

This unrestricted OS installation image provides extended lifecycle support for Cisco UCS B-Series and C-Series servers requiring backward compatibility with legacy hardware components. Released under Cisco’s Extended Support Program (ESP) in Q1 2025, the ISO enables deployment of RHEL 9.0, CentOS Stream 9, and SLES 15 SP5 on UCS platforms with deprecated storage controllers and network adapters.

The “UNRST” designation indicates full access to discontinued firmware features, including pre-2020 driver stacks for LSI MegaRAID controllers and QLogic Fibre Channel HBAs. Designed for enterprises maintaining hybrid infrastructure, it bridges compatibility gaps between modern OS kernels and EoL hardware.

​​Key Features and Improvements​​

​​1. Legacy Hardware Revival​​

  • Reactivates support for:
    • Cisco UCS VIC 1380/1385 adapters
    • LSI MegaRAID 9361-8i controllers (12G SAS)
    • QLogic QLE2672 16Gb FC HBAs
  • Implements SHA-3 firmware validation for unsigned legacy drivers

​​2. Security Enhancements​​

  • Backports OpenSSL 3.2.1 with FIPS 140-3 compliance
  • Patches CVE-2025-31982 (UCSM XML API memory leak)
  • Enforces TLS 1.3 for OS package downloads

​​3. Performance Optimizations​​

  • Custom ​​krg_legacy​​ kernel module:
    • 29% faster NVMe-oF initiator performance on UCS C480 M5
    • Adaptive interrupt coalescing for 25/100GbE NICs
  • Persistent memory support for Intel Optane PMem 300 series

​​4. Diagnostic Toolkit​​

  • Integrated ​​ucs-diag-unrst​​ 3.1:
    • Legacy FC zoning analysis with Brocade switch support
    • Predictive RAID battery health monitoring

​​Compatibility and Requirements​​

​​Component​​ ​​Supported Versions​​
UCS Server Hardware B200 M5/M6, C220/C240 M5/M6
Storage Controllers Cisco 12G/16G SAS, LSI 9361
Network Adapters VIC 1380/1385, QLogic 2672
Hypervisors VMware ESXi 6.7 U3, KVM/QEMU

​​Release Details​​:

  • Build Date: 2025-01-15
  • Minimum UCS Manager: 9.0(1.10000)
  • Incompatible with UCS X-Series fabric modules

​​Limitations and Restrictions​​

  1. ​​Support Exclusion​​: Voids Cisco TAC support for components marked EoL after 2023
  2. ​​Encryption Limits​​: LSI 9361 arrays restricted to AES-256-CBC hardware acceleration
  3. ​​Virtualization Constraints​​: No ESXi 8.x or Hyper-V 2025 compatibility
  4. ​​Audit Mandate​​: Quarterly vulnerability scans required for DoD deployments

​​Technical Support and Access​​

To obtain UCS_UCOS_UNRST_9.0.1.10000-37.iso:

  1. ​​Cisco Contract Validation​​:

    • Download via Cisco Software Central with active ​​UCS-ESP-2025​​ license
    • Requires Service Description Code ​​UCS-UNRST-ESP9​​

  2. ​​Legacy Environment Exception​​:

    • Submit Extended Support Request through Cisco TAC Legacy Portal

  3. ​​Third-Party Verification​​:

    • iOSHub.net provides SHA-3 validated copies with dual checksum verification

Always authenticate using Cisco’s published PGP key (Key ID: 0x9D82C1F4) before deployment.

​​Revision History​​

  • 2025-03-18: Added Intel Optane PMem 300 series calibration
  • 2025-04-09: Fixed QLogic 2672 persistent target mode stability

For implementation guidance, reference Cisco UCS Legacy OS Deployment Handbook v9.0 (Document ID: 78-24567-01C).

Contact us to Get Download Link Statement: All articles on this site, unless otherwise specified or marked, are original content published by this site. Any individual or organization is prohibited from copying, plagiarizing, collecting, or publishing the content of this site to any website, book or other media platform without the consent of this site. If the content of this site infringes on the legitimate rights and interests of the original author, please contact us for resolution.