You could try something like that but thats for a Machine where Powercli is installed:
"Connect-VIServer [Your Vcenter Server]"
"Get-VMHost | Get-VMHostStorage -RescanAllHba -RescanVmfs | ft -autosize"
If you want to do it on a host:
# Adapter rescan
esxcli storage core adapter rescan --all
#VMFS rescan
vmkfstools -V