Fix example of failed migrarion for LVM->RBD
Migration from and to RBD devices works for in-use volumes since
Ussuri release. Also as of now a migration of in-use volumes for
non-active VMs is prohibited for any backends.
Related-Bug:
Related-Bug:
Closes-Bug:
@@ -33,8 +33,11 @@ the migration of 'in-use' volumes is driver dependent. It depends on
different drivers involved in the operation. It may fail depending on
the source or destination driver of the volume.
-For example, from RBD to LVM, the migration of 'in-use' volume will
-succeed, but from LVM to RBD, it will fail.
+For example, for older releases (before Ussuri), the migration of
+'in-use' volume from RBD to LVM will succeed, but from LVM to RBD,
+it will fail. Currently, migration of 'in-use' volumes will not succeed
+for any backend when they are attached to an instance in any of these
+states: SHUTOFF, SUSPENDED, or SOFT-DELETED.
There are two major scenarios, which volume migration supports
in Cinder:
