Cloud services are generally based on multitenancy, which refers to sharing of virtualized hardware infrastructure and application servers between the users, also known as tenants. Multi-tenancy lowers the cost of services for both the providers as well as the tenants. In the context of storage services utilized by software-as-a-service applications, data of all tenants is stored in cloud-based but shared servers, storage, or databases. The sharing of the resources among tenants can result in the co-location of their data within the same storage solution. This can further lead to risks of data tampering or data leaks that must be handled by the provider to ensure the trust of tenants. The separation of various customer data is mandatory to ensure any data stored is not accessible or viewable by another tenant user. This survey investigates the implementation of multitenancy in distributed, cloud-based storage services. It discusses the existing approaches and models employed by commercial cloud service providers. The perspective and solutions presented by researchers are also put forth. Finally, a few open problems and directions for further research are listed.
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