mkdir /mnt/ramdisk mount -t tmpfs -o rw,size=240G tmpfs /mnt/ramdisk
NOTE: This mounts a ramdisk with 240GB under the path /mnt/ramdisk.
Verify that the RAMDISK has been created.
df -h
Edit /etc/fstab, and add the following line to the the end of the file.
tmpfs /mnt/ramdisk tmpfs rw,size=240G 0 0