public void startServers() throws InstantiationException, IOException {
    serverInitialized = true;
    try {
      for (AmbryServer server : serverList) {
        server.startup();
      }
    } catch (Exception e) {
      // clean up other servers which was started already
      cleanup();
      throw e;
    }
  }
Start up all the servers.
@throws InstantiationException
@throws IOException
ambry-test-utils/src/main/java/com/github/ambry/server/MockCluster.java