Troubleshooting
Problem
Resolving The Problem
CIMOM (CIM Server) - What is it?
The Common Information Model (CIM) is a language-independent programming model that defines the properties, operations, and relationships of objects in enterprise and Internet environments. The CIM and Web-Based Enterprise Management (WBEM) are standards that are developed by a consortium of major hardware and software vendors (including IBM) called the Distributed Management Task Force (DMTF). The CIM provides the framework by which a system can be managed by using common building blocks rather than proprietary software. If a device is CIM-compliant, software that is also CIM-compliant can manage that device. The CIMOM server was introduced starting on the V5R3 operating system (OS).
CIMOM is part of the 5770UME product.
Who uses CIMOM on IBM System i system?
CIMOM server is required by ESA for collecting Inventory and it is a prerequisite product for ESA to work properly. Information is found on the Pre-activation checklist at IBM Documentation.
5770UME V1R4M0 is supported on IBM i V7R2 to V7R5
NOTE: The Universal Manageability Enablement product (5770-UME) CIM server is withdrawn from IBM® i 7.6. 5770-UME is no longer required by Electronic Service Agent on IBM i 7.6.
IBM Universal Manageability Enablement (5770-UME) CIM server withdrawn - IBM Documentation
My CIMOM server is taking high CPU, is this normal?
When the CIMOM server starts for the first time, it will build an information database that will consume CPU as it indexes the contents. The job name will be QUMECIMOM in subsystem QSYSWRK. This condition can last for hours, depending on available resources and system size.
How does CIMOM start?
CIMOM can be set to autostart with TCP servers as an autostart server in QATOCSTART/QUSRSYS as TCP Server *CIMOM. It will also be automatically started by running the STRTCPSVR *ALL command. In addition, it can also be started by a user who run the STRTCPSVR *CIMOM command or adds that command in a startup procedure.
If you want to make CIMOM not autostart, use the following command:
CHGTCPSVR SVRSPCVAL(*CIMOM) AUTOSTART(*NO)
Note: The CIMOM server job (QUMECIMOM) IS REQUIRED for Electronic Service Agent (ESA) starting at 7.2. It's needed for ESA Inventory data collection, and impact Problem Reporting (Call Home). Proposed workaround is at CIMOM server certificate document.
On 7.5, having fix SJ05859 applied will remove dependency of CIM Server for ESA. It's recommended also have SJ06007, specially for fresh new systems. With those fixes, there is no need to install 5770-UME product or can be removed.
On 7.4, having fix SJ09722 applied will remove dependency of CIM server for ESA. CIM server (QUMECIMOM job) can be ended and prevent from starting. But 5770-UME product is still required to enable ESA.
Related documents:
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Document Information
Modified date:
04 June 2026
UID
nas8N1018955