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Dell PowerScale SyncIQ: Architecture, Configuration, and Considerations
Executive summary Introduction Deployment topologies Use cases Architecture and processes Data replication Configuring a SyncIQ policy Impacts of modifying SyncIQ policies SyncIQ performance rules SnapshotIQ and SyncIQ SyncIQ design considerations Failover and failback
Introduction
Failover
Target cluster dataset
Failback
Allow-writes compared to break association
Superna Eyeglass DR Edition SyncIQ and CloudPools SyncIQ security SyncIQ bandwidth reservations Monitoring, alerting, reporting, and optimizing performance Administration SyncIQ replication and data reduction 16 TiB large file support and SyncIQ implications OneFS version compatibility SmartLock compatibility Conclusion Appendix A: Failover and failback steps Appendix B: SyncIQ encryption with self-signed certificates Appendix C: Configuring cascaded replication Appendix D: Configuring custom replication Appendix E: Technical support and resources

Failover

Failover

  • In the event of a planned or unplanned outage to the source cluster, a failover is the process of directing client traffic from the source cluster to the target cluster. An unplanned outage of the source cluster could be a disaster recovery scenario where the source cluster no longer exists, or it could be unavailable if the cluster is not reachable.

    On the contrary, a planned outage is a coordinated failover, where an administrator knowingly makes a source cluster unavailable for disaster readiness testing, cluster maintenance, or other planned event. Prior to performing a coordinated failover, ensure that a final replication is completed prior to starting, ensuring the dataset on the target matches the source.

    To perform a failover, set the target cluster or directory to Allow Writes.

    Note: As a best practice, configure DNS to require single forwarding change only. During an outage, this minimizes downtime and simplifies the failover process.

    Failover while a SyncIQ job is running

    It is important to note that if the replication policy is running at the time when a failover is initiated, the replication job will fail, allowing the failover to proceed successfully. The data on the target cluster is restored to its previous state before the replication policy ran. The restore completes by utilizing the snapshot taken by the replication job after the last successful replication job.