Читать книгу The Official (ISC)2 CCSP CBK Reference - Leslie Fife, Aaron Kraus - Страница 24

One way to get the improved efficiencies of cloud computing is through the sharing of infrastructure. A server may have more than one company purchasing access to its resources. These resources are shared by the tenants. Like an apartment building, these tenants share resources and services but have their own dedicated space. Virtualization allows the appearance of single tenancy in a multitenancy situation. Each tenant's data remains private and secure in the same way that your belongings (data) in an apartment building remain secure and isolated from the belongings (data) of your neighbor.

However, as the building is shared, it is still the responsibility of each tenant to exercise care to maintain the integrity and confidentiality of their own data. If the door is left unsecured, a neighbor could easily enter and take your things. It is also necessary to consider the availability of the data as the actions of another tenant could make your data inaccessible for a time due to no fault of your own. In our example, if another tenant is involved in illegal activity, the entire building could be shut down. Or, if another tenant damaged the building, your access might be reduced or eliminated. A multitenancy environment increases the importance of disaster recovery (DR) and business continuity (BC) planning.