#!/bin/bash

for id in g3 f4 h3 j3 n4 q3 q4 r4 x3; do
  echo -n "centos $id:"
  rsync centos$id.centos.org::CentOS-incdvd/TIME >/dev/null && echo OK || echo Fail
done

#to find more servers use
#SRV=`dig @pdns1.centos.org. msync-dvd.centos.org | grep ^msync | awk '{print $5}'`; echo $SRV; rsync $SRV::CentOS-incdvd/TIME