Clustered storage architectures can either be tightly coupled or what other type?

Clustered storage architectures are categorized into tightly coupled and loosely coupled systems. In loosely coupled architectures, each node in the cluster operates independently and communicates over a network. This means that the nodes can have their own local storage and management, which allows for greater flexibility, scalability, and fault tolerance compared to tightly coupled systems where nodes are more interdependent and rely on shared resources.

Loosely coupled designs optimize resource allocation and can often handle different types of workloads more effectively due to their inherent independence. This adaptability is particularly beneficial in dynamic environments where components may need to be added or removed frequently. Such architectures also allow for better resilience, as the failure of a single node does not necessarily compromise the entire system.

Meanwhile, other options mention structures like scattered, partitioned, or distributed, which may incorporate different aspects of clustering but do not specifically define a recognized category that contrasts directly with tightly coupled architectures in the context of storage systems. Thus, "loosely coupled" is the correct answer, highlighting a fundamental characteristic of storage clustering.