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Synchronous Mirroring feature

The Synchronous Mirroring feature is used for online, real-time data replication between storage arrays over a remote distance. Storage array controllers manage the mirroring, which is transparent to host machines and software applications. You create one or more mirrored volume pairs that consist of a primary volume at the primary site and a secondary volume at a secondary, remote site.

After you create the mirror relationship between the two volumes, the current owner of the primary volume copies all of the data from the primary volume to the secondary volume. This process is called full synchronization.

This table shows the maximum number of defined mirrors that can be defined for each controller model.

Storage Array Maximum Number of Defined Mirrors
EF560 controller-drive tray Up to 128
E5600 controller-drive tray Up to 128
EF550 controller-drive tray Up to 128
E5500 controller-drive tray Up to 128
E2700 controller-drive tray Up to 32
Reasons for using Synchronous Mirroring

The Synchronous Mirroring feature is not supported in a simplex configuration. In addition, Synchronous Mirroring feature is supported only in storage arrays with Fibre Channel (FC) host ports and dedicated host ports on the controller, and requires an FC network switch.

Note: Possible loss of data access - You cannot create a mirror relationship if the primary volume contains unreadable sectors. Furthermore, if an unreadable sector is discovered during a mirroring operation, the mirror relationship fails.
For more information about getting started with Synchronous Mirroring, refer to the following online help topics in the Array Management Window::