There are two datacenters separated by twelve (12) km with IP connections linking the two sites. Site A is the primary production site, Site B is for test/development & disaster recovery. Site A synch

When the communication link (ISL - Inter-Switch Link) between two interconnected SAN fabrics is lost, the single merged fabric segments into two distinct, independent fabrics. Each resulting segment, now isolated, detects the change and initiates a fabric build process to re-discover and establish its topology and services, acting as a standalone fabric.

While I/O might be impacted due to the segmentation, the immediate storage event at the fabric level is segmentation and subsequent fabric build, not applications stopping I/O, which is a symptom rather than the direct fabric event.

Reconfigure fabric is a general term; build fabric specifically refers to the process of establishing the fabric topology and services, which happens after segmentation.

Non-SAN disk I/O (e.g., direct-attached storage) would typically not be directly halted by a SAN fabric segmentation event, as they are outside the SAN.