CIM (Common Information Model)

CIM (Common Information Model)
Name	CIM (Common Information Model)
Developer	Distributed Management Task Force
Released	1996
Operating system	Cross-platform
Platform	Information modeling, Management
License	Open standard

CIM (Common Information Model) is an open standard for representing managed resources in heterogeneous IT and industrial environments. It provides a vendor-neutral schema and semantic framework that enables interoperability among management systems, network devices, storage arrays, servers, and applications. The model underpins a range of protocols, profiles, and implementations that span enterprise, cloud, and utility domains.

Overview

CIM defines a conceptual schema and an ontology for managed elements using a class hierarchy and associations, enabling tools to express infrastructure as interoperable objects. The specification is maintained by the Distributed Management Task Force and has influenced standards and products developed by organizations such as Microsoft, IBM, Hewlett-Packard, Intel, and Oracle. CIM integrates with protocols and specifications from DMTF, SNIA, ISO, IEEE, and IETF to support interoperability across platforms like Windows Server, Linux, Solaris, and proprietary network equipment from Cisco Systems and Juniper Networks.

History and Development

Work on a common model began in the 1990s to address fragmentation among management interfaces used by vendors like IBM and Hewlett-Packard. The Distributed Management Task Force consolidated practices from legacy frameworks and aligned them with industry efforts including WBEM and SMASH, building on earlier management models influenced by System Management Architecture for POSIX and vendor initiatives at Sun Microsystems. Major milestones include the publication of formal schemas, mappings to XML and CIM-XML, and subsequent adaptations to web services driven by collaborations with Microsoft and standards bodies like ISO/IEC.

Architecture and Core Concepts

CIM's architecture centers on a metamodel that defines classes, properties, methods, and associations arranged in namespaces such as the CIM Schema core and extension profiles. Core concepts include managed elements like ManagedElement, submodels for compute (Processor, Memory), storage (StorageExtent, DiskPartition), networking (NetworkAdapter, SwitchPort), and services (Service, Process). The model supports inheritance, qualifiers, and association classes to express relationships like containment and dependency. Interoperability is enabled via mappings to protocols such as CIM-XML, WBEM, and WS-Management and by profiles like SMASH and SNIA SMI-S that constrain the schema for domains including servers and storage.

Implementations and Standards

Implementations of the model exist in products and open-source projects from vendors including Microsoft (through Windows Management Instrumentation relationships), OpenPegasus by the Open Group, and management suites by HP Enterprise and IBM Tivoli. Standards and specifications that reference or build on the model include WBEM, WS-Management, SMASH, SMI-S (Storage Management Initiative Specification) from SNIA, and cloud-oriented adaptations by organizations such as DMTF in the form of CIMI-related work. The model is often bound to schema languages and encodings like XML Schema, CSDL, and mapping documents maintained by international bodies such as ISO.

Use Cases and Applications

CIM is applied in data center management for asset inventory, configuration management, and fault detection across products from Dell Technologies, NetApp, EMC Corporation, and Cisco Systems. It supports storage management scenarios standardized by SNIA SMI-S, network topology discovery used by network management systems from SolarWinds and CA Technologies, and server lifecycle operations in orchestration suites from VMware and Red Hat. Utilities and smart grid projects leverage CIM principles (distinct industry models also named CIM) in interoperability efforts by organizations like IEC and IEEE when integrating supervisory control and data acquisition with enterprise IT.

Tools and Ecosystem

A diverse ecosystem provides SDKs, brokers, and agents that expose CIM-compliant interfaces. Prominent tooling includes OpenPegasus CIMOM, client libraries in languages supported by Microsoft .NET Framework, Python bindings used by Red Hat and cloud projects, and vendor agents embedded in firmware from Intel and Broadcom. Monitoring platforms and orchestration frameworks from Nagios, Zabbix, Ansible, and Puppet can be integrated with CIM-aware connectors, while enterprise management suites from BMC Software and IBM Tivoli offer deeper lifecycle and event management built on CIM mappings.

Criticisms and Limitations

Critics point to the model's complexity, steep learning curve, and the challenge of keeping vendor schemas consistent across ecosystems including OEM hardware and disparate software stacks. Interoperability can be hindered by incomplete or vendor-specific extensions observed in implementations from Dell Technologies and Hewlett-Packard Enterprise, and by limited adoption of canonical profiles in smaller vendors. Performance and scalability concerns arise in large-scale telemetry scenarios compared with lightweight telemetry protocols standardized by IETF and cloud-native approaches advocated by CNCF projects. Continued relevance depends on harmonization efforts by bodies like the DMTF and adoption in cloud orchestration standards championed by OASIS and other consortia.

Category:Computer standards