LWD based VM snapshot creation failed with error "Unable to connect to target DataDomain host"

Products

• VMware vSphere ESXi

Issue/Introduction

• LWD based VM snapshot creation failed with below error message in vSphere UI:
  
  Task Name Status: Perform LWD-based snapshot sync
Cannot complete the operation. See the event log for details. A disk was closed during the operation. This can happen due to VM lifeCycle events such as VM power off, vMotion and HA failover. The operation should be retried.


• In /var/run/log/dpd.log file of ESXi host, there are entries similar to:
  
  YYY-MM-DDTHH:MM:SS Er(163) dpd[30270911]: [Originator@6876 sub=Task opID=39e36d09-6d0a] Task 'Dp.Task.Sync.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.Full' failed with error: (dp.fault.SnapshotTransportFault) {

YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->    faultCause = (vmodl.MethodFault) null,

YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->    faultMessage = <unset>,

YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->    transportProviderResults = (vim.KeyValue) [

YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->       (vim.KeyValue) {

YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->          key = "syncOpResults",

YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->          value = "{"errorCode":"TargetDataDomainUnreachable","errorMessage":"Unable to connect to target DataDomain host. Error message: Failed to connect to '<DataDomain-Host-FQDN>', conn_config_ver='6', err=illegal operation","isRetriable":true,"additionalFiles":[],"diskResultKeys":["xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx","xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx","xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"]}"
YYY-MM-DDTHH:MM:SS Er(163) dpd[30270879]: -->       }

Environment

VMware vSphere ESXi 7.0
VMware vSphere ESXi 8.0

Cause

ESXi host can't reach the target Data Domain host and ping test failed.

Resolution

Engage the networking team to fix the connectivity issues between ESXi host and the target Data Domain host.