iSCSI (Internet Small Computer System Interface) is a network storage protocol that enables block-level data transfer over TCP/IP networks. It allows clients (initiators) to access remote storage devices (targets) as if they were locally attached.

Features of iSCSI:

• Block Storage Protocol: Provides direct access to storage blocks, making it suitable for databases and virtual machines.
• Software & Hardware Support: Works with software initiators, hardware HBAs, and enterprise storage systems.
• Multipath I/O (MPIO): Supports multiple network paths for redundancy and load balancing.
• Security Features: Uses authentication (CHAP), encryption, and access controls to secure data transfer.
• Scalability: Easily integrates with SAN (Storage Area Networks) and cloud-based storage solutions.
• Cross-Platform Compatibility: Supported on Linux, Windows, and various enterprise storage appliances.

To check the installed version, use: iscsiadm --version

Disclaimer: iSCSI is an industry-standard protocol developed by the IETF and widely implemented in both open-source and commercial storage solutions.