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Réplication asynchrone

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The day may come when all efforts to safeguard data at the production site has failed. Every minute of downtime could mean 10’s or 100’s thousands of dollars of lost revenue, and even worse, a damaged industry reputation. With asynchronous remote replication, the data is duplicated and becomes quickly accessible in the event that the production site becomes unavailable. Asynchronous replication or asynchronous mirroring provides the highest integrity and the most flexible disaster recovery service for all applications and business-critical data.

One of the first issues to resolve is the location of your remote site. This can be either one of your facilities far from your primary data center, a distant co-location facility shared with others, or a public cloud service. DataCore SANsymphony offers remote replication solutions to satisfy any of these choices. The graphic on the right illustrates a common configuration where the production site operates on a fully-redundant synchronously mirrored pair of SANsymphony nodes replicating asynchronously to a remote SANsymphony node over a WAN.

Asynchronous remote replication with DataCore SANsymphony
Asynchronous remote replication with DataCore SANsymphony ensures mirroring of data between sites, ensuring disaster recovery

Réplication vers Azure Cloud

If you would like to take advantage of the scalability, flexibility and cost-efficiencies of cloud services and/or if you do not have an appropriate physical location available, DataCore™ Cloud Replication on the Azure Marketplace offers a convenient alternative.

Les partenaires agréés de DataCore peuvent vous aider à mettre en œuvre une réplication à distance vers Azure, tout en vous permettant d'effectuer une reprise après sinistre depuis n’importe où dans le monde, ainsi que de faire évoluer votre infrastructure hors site au besoin. Parmi les autres options figure la réplication vers Amazon Web services.

Dynamic Mirror Path Balancing to Increase Usage Density

Dynamic mirror path balancing allows the expansion and the ability to maximize the utilization of interconnections between DataCore SANsymphony nodes. This is done by increasing the functionality of the asynchrone mirroring and utilizing dynamic active pathing to improve the throughput and resiliency.

Advanced Site Recovery

The data is safe at the remote site, now what? Many companies go this far, but fail to take the next critical step in their DR plan: Testing. With Asynchronous remote replication, non-disruptive tests can be conducted against the production data and applications as often as needed. Simply engage test mode for any volume at the remote site and the remote application servers are presented with the latest copy of the production volume. When the test is complete, simply disengage test mode and the state of the system reverts back, with no impact on production.

But what if a failover and then a subsequent failback become necessary? This is much more difficult. DataCore SANsymphony’s Advanced Site Recovery feature automatically reverses the asynchronous replication direction after the production site is ready to re-synchronized with the latest updates that have transpired at the DR site. Once both locations are in synch, the production site can once again take over primary IT responsibilities. And, unlike other solutions, a full resynchronization of all the data is not necessary to bring the original site back online. This saves time, money, and a lot of frustration, not to mention prevents unnecessary downtime during the transition.

Schéma de réplication des données entre les sites
La fonctionnalité Advanced Site Recovery inverse automatiquement le sens de la réplication asynchrone après une opération de failover ou de failback pour garantir la mise à jour complète du site alternatif une fois les services restaurés.

Points forts de la fonction de réplication asynchrone

  • Parfait pour la reprise après sinistre, les migrations entre sites et les tests d’applications de site distant
  • Une connexion IP de base avec les sites secondaires suffit
  • Transferts bidirectionnels
  • Réplication vers des installations distantes, des locaux en colocation et des services de Cloud public
  • Disponible sur la Place de marché Azure sous le nom de DataCore Cloud Replication
  • Protocole asynchrone pour tolérer les retards de transmission et les pannes de liaison
  • Central site to remote sites (one-to-many)
  • Remote sites to central site (many-to-one)
  • Plusieurs vers plusieurs
  • Transferts compressés, multi-flux pour des performances plus rapides et une utilisation optimale de la bande passante
  • Allocation de la bande passante de liaison entre des disques répliqués en fonction de profils de stockage définis par l’utilisateur
  • Accélération de l’initialisation du site distant à l’aide de supports transportables
  • Test de préparation à la reprise après sinistre sans nuire à la production
  • Le sens de réplication peut être inversé à l’aide de la fonction Advanced Site Recovery
  • Intégration avec VMware Site Recovery Manager (SRM)

How is Asynchronous Replication Different from Synchronous Replication?

Asynchronous replication duplicates data between distant storage devices where transmission delays preclude synchronous replication. For example, as a primary datacenter replicating to a remote Disaster Recovery site. Applications writing data receive acknowledgement when the data is stored locally, without waiting on the remote site to save the copy.

In contrast, with synchronous replication (also known as synchronous mirroring) hosts receive acknowledgment of writes only after the remote site has saved a copy. This ensures that both sites have the same data. If one site fails, the other site can seamlessly take over without disruption; a pre-requisite for uninterrupted access across stretch or metro clusters configured for high availability / business continuity.

Both techniques are used in tandem, proving complementary for different use cases. DataCore SANsymphony supports both asynchronous replication and synchronous mirroring empowering IT teams to serve their needs both in terms of disaster recovery and business continuity.

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