REdhat server is very slow , how to resolve?
 

Redhat linux 6.3 server is very slow , what need to be done?
How to resolve the issue ?how to find a root cause for this ?

Check which process eating the resources
#top -c
#vmstat
#sar

# tail /var/log/messages
# dmesg
# free -m
# df -h
# smartctl -H /dev/sda (or other drive)

Usually, if this is a new problem -- reboot. Make sure you have a backup first in case of drive failure.