vmkcore partition

hi guys,

i have a vsphere machine,

i am trying to see vmkcore partition using "fdisk -lh". it is showing that "vmware vmkcore" partition was mounted to /dev/sda2 partition.

But i am not able to see that partition by using "df -h". plz see the attached picture for better understand

i hope  my question making sence.

thanks inadvance.