Open Stack

Hello everyone,

i'm currently trying to figure out how to migrate my volumes from my 
ceph backend. I'm currently using Ceph Luminous, but so far it has 
proven not really prod ready for us, so we want to downgrade. However, 
our client already has some of his VMs on this ceph cluster and 
downgrading means backing them up somewhere. THe best course of action 
for us would be live migration to local lvm storage, but it isn't 
possible via the standard cinder migrate tool - i always get an error, 
nothing happens. We are running openstack pike. Does anyone have any 
procedures/ideas for making this work? Our last resort is rbd exporting 
the volumes to another cluster and then importing them back after the 
downgrade, but we'd prefer to do a live migrate. Apparently this has 
worked in the past. Thanks

Josef Zelenka