iSCSI (Internet Small Computer System Interface) is a storage networking protocol that allows storage devices to be shared over a network. With iSCSI, storage devices can be accessed remotely over the network as if they were locally attached to the server.

iSCSI storage systems can be implemented in a variety of ways, including using dedicated hardware appliances or through software-based solutions that can be installed on existing servers. The storage devices can be either hard disk drives or solid-state drives, and can be configured as standalone units or as part of a larger storage network.

One of the key advantages of iSCSI is its flexibility. It can be used to create centralized storage solutions that can be accessed by multiple servers or clients, which can help to reduce costs by avoiding the need for each server to have its own storage. Additionally, iSCSI can be used to extend the life of existing storage systems by allowing them to be accessed over the network, rather than being replaced entirely.

iSCSI also supports a variety of advanced storage features, such as snapshots, replication, and thin provisioning, which can help to optimize storage usage and improve data protection. These features can be particularly useful in environments where storage requirements are constantly evolving and changing.