code: func (c *Conn) nodesUp() error {
  	if !c.one.Up() {
  		return fmt.Errorf("one %v is not up", c.One)
  	}
  	if !c.other.Up() {
  		return fmt.Errorf("other %v is not up", c.Other)
  	}
  	return nil
  }
docs: // nodesUp returns whether both nodes are currently up