Error: Missing Dependency: perl(Compress::Raw::Zlib) = 2.024 is needed by package perl-IO-Compress-2.030-1.el5.rf.noarch (dag)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.
[root@www ~]#

解决：

yum --skip-broken update

Error:There are unfinished transactions remaining. You mightconsider running yum-complete-transaction first to finish them

#yum install yum-utils

# yum-complete-transaction

Yum is telling you that there\'s an incoplete transaction - running \'yum-complete-transaction\' first should clear it up.

yum clean all yum update glibc\\* yum --exclude=elfutils-libelf* --exclude=python* update