ESXi Host Becomes Unresponsive Until Reboot.

Products

• VMware vSphere ESXi 7.0

Issue/Introduction

Symptoms:

• vCenter detects ESXi host became unresponsive.
• ESXi host vpxa.log outputs like "N7Vmacore15SystemExceptionE(Too many open files)" and "N5Vmomi5Fault17HostCommunication9ExceptionE(Fault cause: vmodl.fault.HostCommunication)"
    

Environment

Versions earlier ESXi 7.0 U3Q 

Cause

File lock issue fixed in ESXi 7.0 U3Q causes the hung of vpxa process.

Resolution

Update to ESXi 7.0 U3Q

Additional Information

ESXI 7.0 U3Q Release Notes - https://techdocs.broadcom.com/us/en/vmware-cis/vsphere/vsphere/7-0/release-notes/esxi-update-and-patch-release-notes/vsphere-esxi-70u3q-release-notes.html