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A Method and System for Providing an Efficient Concurrent 3-Way Replication Continuity for Consistency Groups during Source Fail-Over

IP.com Disclosure Number: IPCOM000239820D
Publication Date: 2014-Dec-03
Document File: 4 page(s) / 154K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method and system is disclosed for providing an efficient concurrent 3-way replication continuity for consistency groups during source fail-over.

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This is the abbreviated version, containing approximately 51% of the total text.

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A Method and System for Providing an Efficient Concurrent 3-Way Replication Continuity for Consistency Groups during Source Fail-Over

Disclosed is a method and system for providing an efficient concurrent 3-way replication continuity for consistency groups

during source fail-over. The method and system allows users to configure high availability and disaster recovery solutions by combining three storage arrays using a 3-way replication feature. The three storage arrays are combined by considering both collocated and geographically dispersed sites, while keeping at least one copy of data in each storage

array. The unique feature thus allows continued replication between the remaining storage arrays (sites) in case there is any failure in one or more of the storage arrays (sites) while helping to achieve PRO objective and efficient utilization of

network bandwidth.

In accordance with the method and system, as illustrated in the Fig. 1, a concurrent 3-way replication configuration

consists of three storage arrays A, B and C.

Figure 1

A consistency group (CG) of storage volumes on A (hereafter referred to as source) is synchronously replicated to a CG of storage volumes on B (hereafter referred to as secondary source). The same CG on A is asynchronously replicated to a CG of storage volumes on C (hereafter referred to as destination). Both of these replication relations are active. In

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order to complete the solution, the CG on B and the CG on C have an asynchronous replication relation that acts as standby, aimed to immediately be activated when A fails over to B. In such a case CG B becomes the new source for the storage volumes in the CG on C. In other words, the CG B acts as the secondary source in case of CG A source failure.

In the majority of the deployments, C is located on a remote site with a limited bandwidth connection to both A and B (C's site is considered the disaster recovery site). Hence, replication traffic optimization to C are considered in the concurrent 3-way replication architecture.

Storage arrays would have to initialize the asynchronous replication relation between CG B and CG C, when B-C asynchronous replication relation becomes act...