docs: protected void rrdToolCreateDatabase(RrdDef def) throws Exception {
  		List<String> commands = new ArrayList<>();
  		commands.add(this.binaryPath + "/rrdtool");
  		commands.add("create");
  		commands.add(this.outputFile.getCanonicalPath());
  		commands.add("-s");
  		commands.add(String.valueOf(def.getStep()));
  
  		for (DsDef dsdef : def.getDsDefs()) {
  			commands.add(getDsDefStr(dsdef));
  		}
  
  		for (ArcDef adef : def.getArcDefs()) {
  			commands.add(getRraStr(adef));
  		}
  
  		ProcessBuilder pb = new ProcessBuilder(commands);
  		Process process = pb.start();
  		try {
  			checkErrorStream(process);
  		} finally {
  			IOUtils.closeQuietly(process.getInputStream());
  			IOUtils.closeQuietly(process.getOutputStream());
  			IOUtils.closeQuietly(process.getErrorStream());
  		}
  	}