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IBM System Storage N series Software Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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MetroCluster
This chapter describes the MetroCluster feature, which is an integrated, high-availability, business continuance solution that allows clustering of two N6000 or N7000 storage controllers at distances up to 100 kilometers.
The primary goal of MetroCluster is to provide mission-critical applications with redundant storage services in case of site-specific disasters. By synchronously mirroring data between two sites, it tolerates site-specific disasters with minimal interruption to applications and zero data loss.
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