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Adding Additional Disk Space to an ESXi Boot Partition

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This post aims to solve the most common issue that I’ve faced with our (admittedly not too large) ESXi infrastructure – how to add more drive space to a CentOS VM that only has one virtual HD. Strangely enough, this is more obtuse than it really should be!

Note: this would be normally be completely unnecessary if you allocate enough space when creating the VM, but sometimes that’s just not an option.

Warning: you cannot expand the disk of a VM with snapshots!

In general, you have two options for adding drive space:

  1. Make the existing VM HD larger.
  2. Add another VM HD.

I’ll cover option one here, since this makes things somewhat easier because you’re not adding additional virtual hardware.
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