On Wed, 2022-01-05 at 16:24 +0530, KK CHN wrote:
List,
I am in need to migrate a Virtual machine ( running in an old OpenStack environment with only one controller). This VM has its own disk file + a logical volume attached to it with application data on it. Only Cinder backend( No rbd/ceph backend configured ) for this environment.
Now I am migrating this Virtual machine to another OpenStack(ussuri with three controllers, three compute nodes and three storage nodes) environment with ceph/rbd backend.
I am able to export the VM with its disk file and import it to the other openstack environment and able to boot the machine.
But How to export the attached logical volume from the old VM and attach to the VM in the other environment ?
if its just a singel vm you can convert teh volume to an image then download and upload it to the the new cloud and finally create a volume form that image.
if you have to do this wiht more then one vm you might want to look at https://github.com/os-migrate/os-migrate
which is being created to automate migrating workloads betwen clouds it will copy the volume in a more efficent way by directly copying the data form the source could to the destination witout creating images.
what is the methodology to follow to export this logical volume in the old openstack VM and import to the new VM running in the other openstack environment ?
the manual procedure is to convert it to a glance image and download and upload it. that only works if glance is not useing volume backed images. os-migrate will create a migration vm in each cloud, detach the volume from its current vm on the source cloud then attach it to the migration vm on the dest cloud it will create a new empty volume and attch it to the might vm. then it basicly rsyncs the datat from one migration vm to the other.
kindly share your suggestions/expertise to perform this
Thanks in advance for your valuable guidance. Krish