Creating an iSCSI target
iSCSI is an industry-standard protocol that implements block storage over a TCP/IP network. With iSCSI, the server or target provides a volume shared via iSCSI to an iSCSI client, also known as the initiator.
In the original SCSI protocol, you use the term Logical Unit Number (LUN) to refer to a single physical disk attached to the SCSI bus. With iSCSI, you give each remotely shared volume an iSCSI LUN. The iSCSI client then sees the LUN as just another disk device attached to the local system. From the iSCSI client, you can manage the disk just like locally attached storage. Windows Server 2022 includes both iSCSI target (server) and iSCSI initiator (client) features.
You set up an iSCSI target on a server and then use an iSCSI initiator on another server (or client) system to access the iSCSI target. You can use both Microsoft and third-party initiators and targets, although if you mix and match, you need to carefully test that the combination works...