27.5.3.3 Add hard disk
First, we will set up a new hard drive. You will see the following screen:
In addition to the size of the disk, determine its type (Bus). Typically, this will be IDE. In the case of virtualised hard drives, SCSI does not provide a speed advantage. Use VIRTIO for the highest throughput, but you can only use these hard drives in the virtualised instance if you have the appropriate VIRTIO driver.
Select 'qcow2' or 'raw' in the format field. In the case of 'qcow2', the virtualised hard disks increase with every change. In principle, they are versioned. This allows you to create a backup of the current state, which you can go back to later if necessary. Use the 'raw' format if you do not want to create versioned disks. We recommend the 'raw' format for high throughput.
You have the option to enter the device number in the 'Device' field, but you can normally leave ArchivistaVM to enter this information automatically.