When data is written to a LUN in a four-node MetroCluster configuration, what feature is...

MetroCluster uses SyncMirror technology to synchronously mirror data between storage pools at the two MetroCluster sites. Mirrored aggregates contain local and remote plexes, and writes are replicated synchronously so that a current copy of the data exists at the remote site. This storage-level mirroring is fundamental to MetroCluster ' s ability to maintain data availability during site failures and perform switchover operations. SnapMirror active sync is a separate ONTAP technology that provides synchronous application-level protection between peered clusters. SnapMirror Synchronous is likewise a replication technology but is not the underlying aggregate-mirroring mechanism used by MetroCluster. MPIO operates on the host to manage multiple SAN paths and performs no data replication. Therefore, data written to a LUN residing on a mirrored MetroCluster aggregate is replicated to the remote plex through SyncMirror.