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Archive for March 3, 2017

Resizing a virtual machine’s boot drive to use all available space

March 3, 2017 1 comment

Every so often, it’s necessary to resize the boot drive of an existing virtual machine. The process of resizing the VM’s boot disk from outside the VM is usually pretty straightforward:

1. Shut down the VM
2. Go into the VM’s drive settings

Screen Shot 2017 03 02 at 5 02 10 PM

3. Resize it to the desired size

Screen Shot 2017 03 02 at 5 02 23 PM

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4. Power on the VM.

However, when the VM boots up, the disk space used by the OS won’t have changed.

Screen Shot 2017 03 02 at 5 07 55 PM

However, the OS can detect that there is available unallocated disk space that it isn’t using.

Screen Shot 2017 03 02 at 5 08 58 PM

Fortunately, this is a correctable condition and the fix can be applied without needing to shut down the VM or boot from another drive. For more details, see below the jump.

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