Teresa sets up SAN replication for her organization. What has she done?

Teresa has replicated the data from one SAN (Storage Area Network) to another at the block or hardware level. SAN replication is a process that involves creating an identical copy of data from one SAN to another, typically in real-time or near-real-time. This ensures that the data stored on the primary SAN is replicated and available on the secondary SAN, providing data redundancy and resilience.
By implementing SAN replication, Teresa has established a mechanism to protect against data loss in case of SAN failures or disasters. If the primary SAN experiences hardware failures, data corruption, or other issues, the secondary SAN can seamlessly take over and continue serving the data. SAN replication is commonly used for disaster recovery purposes to minimize downtime and ensure business continuity.