Unable to clone VM, error "Could not complete network copy for file"

Products

• VMware vSphere ESXi

Issue/Introduction

Clone of VM fails with error 

Could not complete network copy for file /vmfs/volumes/####-####-####-####/<vmname>/vmname.vmdk

Environment

VMware vSphere ESXi 7.x
VMware vSphere ESXi 8.x

Cause

Medium errors reported against the backing lun

vmkernel.log reports

Cmd(0x45d91db504c8) 0x28, CmdSN 0x13eb53b from world 2099234 to dev "naa.####" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x3 0x11 0x0 Medium Error, LBA:

VMware ESXi SCSI Sense Code Decoder

Resolution

Engage hardware vendor to check medium errors on lun

Additional Information

Note: to quickly find disks with medium errors on a host with their number of errors, run the command
grep "0x3 0x11" /var/log/vmkernel.log | awk -F "dev" '{print $2}' | awk '{print $1}' | sort | uniq -c