Today, technology migrations are an essential part of the IT landscape and storage is no exception.



With EMC Open Replicator for Symmetrix is designed to minimize the risk, disruption with the data migration.  All the host I/O is processed against the Symmetrix DMX array while data is copied in the background, so there is a single disruption to applications; once the Symmetrix DMX array is in place, there is no further configuration impact is required. At the host level, the data is available to host applications immediately even if it haven’t been copied over. It is retrieved and available at the somewhat slower rate.

Once all the data has been copied over, we can unplug the donor storage and remove it from the environment. EMC Open replicator for Symmetrix functionality is fully supported by the EMC TimeFinder/Clone and TimeFinder/Mirror productions.  Open Replicator Functionality allow the easily and quickily create point-in-time copies, it also integrate with TimeFinder components, which is allow to copied to remote storage systems using EMC Open Replicator.

EMC Open Replicator

EMC Open Replicator able to keep a second local copy by allowing you to create remote consistent point in time images of the local volumes whiles it still continuing with the normal production. That mean when face with the dilemma of making consistent copies of multiple online data volumes and sending them to a remote system, most solutions require you to use a static copy of the data. It is either stopping I/O to the volumes or creating the separate local copy. While this has advantages in terms of performance, it can be costly in terms of disk space.

Open Replicator for Storage Migration

1.     EMC Open Replicator uses FA resources. Most of the migration activity are happen in a production environment, thus the SA and FA bandwidth assessments has been considered and the appropriate throttling parameters.

2.             If the configuration uses thin devices as the destination in a pull or push copy operations, full volume allocation of the thin device will be made because EMC Open Replicator creates a full volume copy.

3.             To protect against the potential data loss due to a SAN failure or other connectivity issues during a hot pull operations, use the donor update option. When enabled, this feature causes all writes to the control device from the host to be immediately copied to the remote device as well.  This is because the data is fully copied to both remote device and the control devices, if the failure occurs in between, the session can safely be terminated and create again to fully recover from any mid-copy failure.

4.             It is better and easier to use an Open Replicator management host for preparing, monitoring and executing migration sessions than using one of the systems with volumes involved in the activity.

5.             During the Migration (Using Open Replicator), always use the –v qualifier on the create command. This is insures that should there session fail, there will be useful information returned as to what volume caused the error. This allows you to more quickly recognize zoning or masking issues.