Newer operating systems such as Windows 2008 and Windows Vista. If you have never used VMFS2 and not used fdisk or vmkfstools, you should not expect.
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This post explains about the step by step procedure to expand the virtual machine VMDK size using vmkfstools. Prior ESX 3.5, There is no option to extend the virtual hard disk size from vSphere client. Virtual harddsik expansion can be done only via CLI with the help of vmkfstools command and also you need to power down the virtual machine before proceeding with the below steps prior ESX 3.5. Log in to the ESX using SSH with the root credentials. Before proceeding with the expansion step.
Let’s take a look at my virtual machine “ winxp-arena” has hard disk with the provisioned size of 14 GB.