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Understanding the VVR snapshot feature

VVR enables you to create an image of the online data volumes, at a given point in time and such an image is referred to as a snapshot. The data in the original volume may change; however, the snapshot can still be used as a stable and independent copy for various purposes, including the following:

• to restore data both on the Primary and Secondary if the original data gets corrupted because of logical errors, administrative errors, or media errors such as disk failures.
• to verify the Disaster Recovery (DR) readiness of the DR site or perform firedrill activities.
• to create a copy of the data for application development or testing.
• to support off-host processing for applications such as Decision Support Systems (DSS) or for report generation.
• to perform online data verification of the volumes in an RVG when replication is in progress.
• to retain a consistent copy of the Secondary data volumes during Data Change Map (DCM) resynchronization.

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    Note   You can use the snapshot feature on the Primary and the Secondary host.

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The snapshot feature in VVR is the same as the snapshot feature in VxVM, because VVR is fully integrated with VxVM. In VVR, an RVG is a group of VxVM volumes; therefore, taking a snapshot of an RVG is the same as taking a snapshot of the data volumes in the RVG.

VVR provides two methods of creating snapshots which are:

• Traditional snapshot feature
• Instant snapshot feature