Question: how to enable kdump in rhel 6?
Answer: Make sure /var/crash has space for vmcores. ...  Add crashkernel=128M to your kernel command line in /boot/grub/grub.conf. Setup /etc/kdump. ...  Make sure the kdump service is set to start on boot and restart the system. Check that there is an initrd in /boot created for kdump. ...  Test your configuration.