When a VM instance is created through Waldur, it is created using Cinder service with 2 volumes:
- root volume containing OS root image, bootable;
- data volume an empty volume for data.
VM resize (flavor). To change memory or CPU number, a flavor should be changed. Please note, that the disk size is not affected. Change can happen only for a stopped VM.
VM resize (disk). Increasing a disk size means extension of the data volume attached to the instance. The process includes detaching of a data volume, extending it and re-attaching to a VM. Disk can be increased only for a stopped VM.