Volumes are typically specified as disk partitions, with one volumedesignated as the root volume containing the root cluster.
卷被特别指定作为分区的依据，用一个指定的卷当作根卷被包含到根集群中。
2
In Figure 2, users Admin1, Admin2 and Admin3 are logical volume administrators and are ideally designated to manage any of the logical volume groups (vg1, vg2 and vg3) in RBAC model.