HCX migration fails with "Failed to reconfigure source Mobility Agent" due to full / directory on IX appliance

Products

• VMware HCX

Issue/Introduction

Symptoms:

• VM migrations via HCX fail at the "Reconfiguring Source Mobility Agent" stage.
• Users see "Failed to reconfigure source Mobility Agent" in the HCX Manager UI.
• HCX IX /var/log/vmware/mobilityagent.log has error below:

No space left : /etc/vmware/mobilityagent/mockup-host-config.xml.tmp

Environment

VMware HCX 4.x

Cause

The root (/) partition on the HCX Interconnect (IX) appliance is full. This is often caused by large logs or temporary files accumulating in /tmp, preventing the Mobility Agent service from writing necessary configuration files.

Resolution

 

Delete the unnecessary large files from HCX IX appliance /tmp directory and then retry VM migration:

• SSH to the affected HCX-IX appliance.
• Check disk usage: df -h.
• If / is 100% full, check the /tmp directory: du -sh /tmp/* | sort -rh.
• Remove large, unnecessary files: rm /tmp/[FILENAME].
• Confirm space is cleared and retry migration.