Adding a disk to a virtual machine, attempting to start a virtual machine, or exporting a template to storage fails with "Low disk space on relevant Storage Domain"

Solution Verified - Updated 2015-04-14T15:48:19+00:00 -

Issue

If the remaining space on the storage domain is less than 10% of the total storage domain size, attempting to add a new disk to a virtual machine (vm) fails with the following error message:
```
Cannot add Virtual Machine Disk. Low disk space on relevant Storage Domain.
```
If the remaining space on the storage domain is less than 5 GB of the total storage domain size, attempting to start a virtual machine (vm) from the Manager UI will fail with the following error message:
```
Cannot run VM. Low disk space on relevant Storage Domain.
```
If the remaining space on the storage domain is less than 5GB of the total storage domain size, attempting to start a virtual machine (vm) from the User Portal will result in the following error message being displayed:
```
Operation Cancelled
Cannot allocate and run VM from VM Pool. There are no available VMs in the VM pool.
```

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