Jun'ichi Nomura wrote: > So, you have to put the linear mapping *before* that. > Then, the top-level block device will be locked but you can > still change the underlying mappings. So using a disk device as a dm target locks it. DM won't use a disk device as a target if it is locked. Are you saying that dm can use another dm device as a target, even if it is already locked by being used as another dm target? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel