Error – rpmdb open failed

[root@idcbprhoswrk004 data]# yum clean all
error: db5 error(5) from dbenv->open: Input/output error
error: cannot open Packages index using db5 – Input/output error (5)
error: cannot open Packages database in /var/lib/rpm
CRITICAL:yum.main:

Resolution :

optional :

#mkdir /root/backups.rpm.mm_dd_yyyy/
#cp -avr /var/lib/rpm/ /root/backups.rpm.mm_dd_yyyy/

# rm -f /var/lib/rpm/__db*
# db_verify /var/lib/rpm/Packages
# rpm --rebuilddb