Adding Space to an ESX Server Virtual Disk

ESX 3.5. Use clone to backup. Go into the vm directory which suppose to be in the corrected data store directory. Grep scsi on *vmx file to identify which disk u want to extend. First one should be C: and second should be D: etc etc.

# vmkfstools -X 60G virtualdiskiwanttoextend.vmdk

Refer here. Careful with the number you choose. Above example means change the disk capacity to 60GB, not by 60GB.