Defining a logical backup device involves assigning a logical name to a physical device. 定義邏輯備份設備涉及為物理設備分配邏輯名稱(chēng)。
With this feature, a virtual device bundles a group of physical devices and makes them behave as one. 和這一特性一起,一個(gè)虛擬設備處理一組物理設備,并讓它們一起表現得你是一個(gè)設備一樣。