+++ This bug is a downstream clone. The original bug is: +++
+++   bug 1651939 +++
======================================================================

Description of problem:
The direct LUN is extended on a storage device. Since the Bug 1155275 "[RFE][Cinder] - Online update LUN size to the Guest after LUN resize" 
(https://bugzilla.redhat.com/show_bug.cgi?id=1155275) is not implemented yet, there is a recommendation to put the VM down and start again to have a new size:
https://access.redhat.com/solutions/1230283
The new size is ok for VM and is seen on the hypervisor, multipathd shows the proper size as well, but still in the Admin Portal the LUN size is not updated. 


Version-Release number of selected component (if applicable):
4.x 

How reproducible:
always

Steps to Reproduce:
1. expand LUN on a storage device
2. put the Vm down and start again
3. check and confirm the size inside the VM, even some VG increase can be performed, check on hypervisor the LUN size in multipathd
4. check GUI and confirm it is not updated.

Actual results:
not updated in Admin Portal only

Expected results:
it is updated everywhere

Additional info:
The problems seems to be lack of action "refreshlun" 
I fixed the problem running REST API request:

curl --request POST  --header "Accept: application/xml" --header "Host: ${FQDN}" --header "Authorization: Bearer  ${TOKEN}"  --cacert /etc/pki/ovirt-engine/apache-ca.pem https://${FQDN}:443/ovirt-engine/api/disks/${LUNID}/refreshlun --header "Content-Type: application/xml" --data "<action><host id='${HOSTID}'/></action>"

(Originally by Olimp Bockowski)