This is the result of whay you said:
[root@cp ~]# yum clean all
Loading "installonlyn" plugin
Cleaning up Everything
[root@cp ~]# yum makecache
Loading "installonlyn" plugin
Setting up repositories
extras 100% |=========================| 1.1 kB 00:00
updates 100% |=========================| 951 B 00:00
base 100% |=========================| 1.1 kB 00:00
addons 100% |=========================| 951 B 00:00
primary.xml.gz 100% |=========================| 81 kB 00:43
################################################## 282/282
primary.xml.gz 100% |=========================| 139 kB 00:00
http://centosh2.centos.org/centos/5....rimary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.xml.gz 100% |=========================| 161 kB 00:00
http://centosj.centos.org/centos/5.2...rimary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.xml.gz 100% |=========================| 111 kB 00:00
http://centose.centos.org/centos/5.2...rimary.xml.gz: [Errno -1] Metadata file does not match checksum
Trying other mirror.
i dont know what's this why meta data file does not match checksum
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