Increasing VMware guest OS disk size

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http://serverfault.com – After increasing the size of my linux VM's disk by editing the guest VMs settting via vsphere client I do not see the increase in disk size when I check on the OS (df -h). On a windows VM I went to disk manager and extended the volume to use the unallocated space (which is the disk increase) How do I ensure that the OS sees this disk increase in linux? (HowTos)