Storage group type conversion getting failed

[sathish subramanian]

Brief Description
-----------------
This test validates that the user can convert between different storage types. But when modifying instance_backing as image type conversion using system host-lvg-modify getting error.

Severity
--------
Provide the severity of the defect.
Critical: System/Feature is not usable due to the defect

Steps to Reproduce
------------------
 1. Lock a worker that is hosting VMs
 2. Modify the worker nova-local backend from remote storage to image.
CMD:
 system host-lvg-modify -b image compute-0 nova-local
Error:
 system: error: unrecognized arguments: -b nova-local

So let me know, what is the alternate command for remote to image type change?

Expected Behavior
------------------
It should be possible to modify the nova-local backend

Actual Behavior
----------------
system: error: unrecognized arguments: -b nova-local

Reproducibility
---------------
Reproducible/100%
System Configuration
--------------------
- MN-External (2+2+2)

Branch/Pull Time/Commit
-----------------------
BUILD_DATE="2019-07-18 01:30:00 +0000"

Test Activity
-------------
Feature Testing, Regression Testing

[Bob Church (rchurch)]

Current help text from the command shows this option has been removed.

[sysadmin@controller-0 ~(keystone_admin)]$ system help host-lvg-modify
usage: system host-lvg-modify [-l <lvm_type>]
                              <hostname or id> <lvg name or uuid>Modify the attributes of a Local Volume Group.

Positional arguments:
  <hostname or id> Name or ID of the host [REQUIRED]
  <lvg name or uuid> Name or UUID of lvg [REQUIRED]

Optional arguments:
  -l <lvm_type>, --lvm_type <lvm_type>
                        Determines the thick or thin provisioning format of
                        the LVM volume group. [cinder-volumes]

We currently support local ephemeral storage (QCOW2) image backing by default on a compute worker. The other option is to use RBD backed ephemeral storage from the Ceph cluster. To do this, you need to lock the compute worker and add a Kubernetes label 'remote-storage'(system host-label-assign <worker> remote-storage=enabled) and unlock.

[Ghada Khalil (gkhalil)]

Marking as Invalid based on Bob's comment above

[sathish subramanian (sathis5x)]

Is there any option to modify compute nova-local backend types ?
Note: This CLI not supported(system host-lvg-modify -b remote compute-0 nova-local)
As per commands above, used below steps for label assignment to compute.
And It is not changing nova-local backend.

 >> system host-lock compute-0
 >> system host-lock compute-1
 >> system host-label assign compute-0 remote-storage=enabled
 >> system host-label assign compute-1 remote-storage=enabled
 >> System unlock compute-0
 >> System unlock compute-1

 To remove remote-storage label list from compute-1 and add image label
 >> system host-label-remove compute-1 remote-storage
 >> system host-label-assign compute-1 image=enabled
 >> unlock compute-1

Expected behavior of the test:
 Modify the worker nova-local backend from remote storage to image