Data Collector failing to upgrade

Products

• Network Observability
• CA Performance Management

Issue/Introduction

• After you upgrade Performance Management from version 24.x to 25.4.9, the Data Collector (DC) service (dcmd) fails to start on one or more hosts.
• When you inspect the DC console log (netops-data-collector.out), you see the following error:
  Error occurred during initialization of VM Initial heap size set to a larger value than the maximum heap size

Environment

Dx NetOps Performance Management 25.4.9

Cause

The IM_MAX_MEM parameter in the /opt/DCM.cfg file is misconfigured. In this scenario, the value was set to 1924M, which conflicts with the JVM requirements for the new version.

Resolution

To resolve this issue, you must update the memory configuration to match your environment's available resources and align it with your working Data Collectors. For more details on sizing requirements, please check the DX NetOps Sizing Tool.

1. Check the available memory on the impacted host.
2. Navigate to /opt/DCM.cfg on the impacted DC.
3. Update the IM_MAX_MEM parameter. Ensure this value is set correctly (e.g., 8363M, based on functional DC configurations in your environment).
4. Restart the Data Collector service.

Verify the service status after the restart. If the issue persists, please reach out to Broadcom support for further investigation.