Overview of the replication functions

The replication functions of the storage systems generate and manage redundant data inventories which are created by partial or complete replication (formerly called: mirroring) of the original data inventories.

A distinction is made between the following classes of replication functions according to the distance of the redundant data inventories to their original data inventories:

• Local replication (formerly also called: local mirroring)The redundant data inventories are stored on the same storage system, but on a different volume.

• Remote replication (formerly also called: remote mirroring)The redundant data inventories are stored on a geographically distant storage system.

Overview of the replication functions for ETERNUS DX/AF

Replication function	ETERNUS DX/AF
Local, complete copies	QuickOPC
Local, complete replication	EC
Local copies (snapshots)	SnapOPC+
Synchronous remote replication	REC (synchronous)
Asynchronous remote replication	REC (asynchronous)
Combinations of replication (see also chapter "Mixed forms of replication (ETERNUS DX/AF)")	EC & REC (syn/asyn) EC & SnapOPC+ QuickOPC & REC (syn/asyn) QuickOPC & SnapOPC+ SnapOPC+ & REC (syn/asyn)