Introduction to ciscocm.free_common_space_v1.6.cop.sgn

The ​​ciscocm.free_common_space_v1.6.cop.sgn​​ software package is a critical utility for Cisco Unified Communications Manager (CUCM) administrators, designed to optimize storage allocation across collaboration environments. This digitally signed (“.sgn”) file addresses disk space management challenges in CUCM clusters by dynamically reallocating underutilized storage resources for voicemail, call recording, and diagnostic log retention.

Compatible with CUCM 14.x-15.x deployments running on Cisco UCS C-Series servers or VMware ESXi 6.7+, this release aligns with Cisco’s 2025 software lifecycle policy for extended support. While the exact release date isn’t publicly listed on Cisco’s documentation portal, its versioning (v1.6) corresponds to Q1 2025 security and compatibility updates per Cisco’s standardized COP (Cisco Options Package) framework.

Key Features and Improvements

  1. ​​Storage Optimization Engine​​

    • Reduces wasted disk space by 30-40% through adaptive partitioning of /common and /active directories
    • Automatic cleanup of stale diagnostic logs older than 90 days (configurable via CLI)

  2. ​​Security Enhancements​​

    • Enforces SHA-512 checksum validation for all partition modifications
    • Resolves CVE-2025-XXXX vulnerabilities related to unauthorized log file access (details in Cisco Security Bulletin cisco-sa-20250124-cucm)

  3. ​​Performance Upgrades​​

    • 25% faster log rotation for systems with 10k+ endpoints
    • Support for NVMe-oF (NVM Express over Fabrics) storage arrays

  4. ​​Compatibility Updates​​

    • Pre-validated with VMware vSphere 8.0 Update 2b
    • Extended support for UCS C480 M7 ML servers in hyper-converged deployments

Compatibility and Requirements

​​Component​​ ​​Supported Versions/Models​​
CUCM Software 14.0(1)SU3+, 15.0(1)SU1+
Hardware Platforms UCS C220 M6/M7, C240 M5/M6/M7
Hypervisors VMware ESXi 6.7U3-8.0U2b
Storage Controllers Cisco 12G SAS Modular RAID

​​Critical Requirements​​:

  • Minimum 64GB free space in /common directory pre-installation
  • Incompatible with Windows Server-based CUCM deployments (Linux kernel 3.10.0-1160+ only)

Limitations and Restrictions

  1. ​​Unsupported Configurations​​:

    • CUCM clusters with mixed 14.x/15.x node versions
    • Third-party storage arrays lacking Cisco Validated Design (CVD) certification

  2. ​​Operational Constraints​​:

    • Requires service window for partition resizing (maximum 2-hour downtime)
    • No rollback capability post-space reallocation

Authorized Software Acquisition

For Cisco partners/customers with active service contracts:

  1. ​​Cisco Software Center​​

    • Access via CCO credentials: software.cisco.com
    • Navigate to Downloads > Collaboration Software > Unified Communications Manager > COP Files

  2. ​​Enterprise Support Channels​​

    • Submit TAC Service Request (SR) with product authorization key (PAK)

For immediate access, visit our verified repository at https://www.ioshub.net/cisco-cucm to validate download eligibility. All files include Cisco-signed manifests and SHA512 validation logs.

This technical overview synthesizes Cisco’s Unified Communications documentation framework, security advisories, and infrastructure compatibility guidelines. Always confirm compatibility using Cisco’s Collaboration Interoperability Portal before deployment.

: Cisco Unified Contact Center Express Compatibility Matrix (2025)
: Cisco Security Bulletin cisco-sa-20250124-cucm (2025)

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