1. Add the new formatted Hard disk.
2. Create a new mount point for the disk and make asterisk as the owner of that.
#mkdir /monitor
#chown -R asterisk:asterisk /monitor/
3. Create startup script. You can also use fstab for the same.
Edit /etc/rc.local and add the following line. Here /dev/sdb1 is the first partition of newly attached hard disk.
/bin/mount /dev/sdb1 /monitor
4. Run the startup script.
#cd /etc
#./rc.local
5. Now if you run the below command you should see the hard disk mounted( /dev/sdb1 903G 2.9G 853G 1% /monitor).
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 895G 2.8G 846G 1% /
/dev/sda1 487M 23M 439M 5% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/sdb1 903G 2.9G 853G 1% /monitor
6. Remove the monitor folder and link it to new location.
#rm -rf /var/spool/asterisk/monitor
#/bin/ln -s /monitor /var/spool/asterisk
#chown asterisk /var/spool/asterisk/monitor
7. Change Extension settings to enable recording in Elastix GUI and check if the files are saved in new location.
Tech.. Logs.. 
Exelente
Exelente, por si acaso no sabrías como agregar el segundo HD en el dashboard del elastix como para ver el porcentaje de uso del Disco?
Saludos
Hi Shyju Kanaprath
I did not understand the third step, please explain it more clearly with the photo
Thank you.
In this step we add the mount command to start up file, so that the recording drive will be mounted to the /monitor directory when the the computer starts. You just need to put the mount command at the end of rc.local file.
mount /dev/sdb1 /monitor
Thank you.