for dev, old_lvs, new_lvs in iv_names.itervalues():
info("detaching %s drbd from local storage" % dev.iv_name)
result = self.rpc.call_blockdev_removechildren(tgt_node, dev, old_lvs)
for dev, old_lvs, new_lvs in iv_names.itervalues():
info("detaching %s drbd from local storage" % dev.iv_name)
result = self.rpc.call_blockdev_removechildren(tgt_node, dev, old_lvs)