Which storage model allows direct attachment of storage devices to a server?

Direct Attached Storage (DAS) is the storage model that allows for the direct attachment of storage devices to a server. In this configuration, storage devices such as hard drives or SSDs are physically connected to a server, often through interfaces like SATA, SCSI, or USB. This means the storage is solely accessible by the connected server, leading to improved performance due to the elimination of network latency.

DAS is typically used in scenarios that require high-speed access to data and where a simple storage solution is adequate. It's common in personal computers, workstations, and small servers, providing a straightforward and cost-effective way to expand storage without needing a network configuration.

In contrast, other storage models, such as Storage Area Networks (SAN) and Network Attached Storage (NAS), involve more complex setups where storage devices are accessed over networks. Cloud storage relies on off-site servers accessed via the internet, which adds additional layers of network complexity and potential latency compared to DAS.