Although disaster scenarios may be carefully addressed in the DRP, meeting the overall recovery time objective (RTO)—especially in asynchronous replication environments—is much less assured. This uncertainty is mainly due to data loss.
When you enter the realm of data loss, figuring out what you have lost and then trying to reconcile the data can slow data recovery time to a crawl. Even seconds of data loss can entail hours of downtime as you work to recover data—costing your organization dearly in terms of lost revenue, reputation damage, labor costs, and much more.
Data Loss = Downtime = Cost
Until recently, there was virtually only one course of action for asynchronous replication: Fail over to the secondary site, and then face the data loss music.
Zero data loss in asynchronous replication scenarios has long been accepted as a distant dream.
Well, not any more…
Axxana’s Phoenix arrives equipped with 4G cellular modems that allow you to recover your data under any disaster scenario and with any disaster recovery topology, even if the link between sites fails.
At this point, most skeptics will say “Stop right there. You can’t pass that much data over cellular networks. It’s not fast enough, not reliable enough; it wouldn’t work!”
This notion is based on a number of misconceptions:
Misconception 1: Disaster recovery involves syncing lots of data.
Fact: Not as much data as you might think. Even though most replication topologies are asynch (e.g., max performance and max availability in the case of Oracle® Data Guard), the primary and the secondary sites have already performed initial synchronization prior to the disaster; then, they constantly replicate only the current delta (AKA the lag) between the sites. Even in petabyte -scale databases, in order to achieve true zero data loss (ZDL), only the current delta between the sites needs to be synched, and not the entire database (i.e., the data files); this lag is usually a few gigabytes (GBs) to tens of GBs.
Misconception 2: Cellular networks are not fast enough.
Fact: Cellular networks have caught up fast in the past several years, delivering upload speeds of up to 150 megabits per second (Mbps) for 4G LTE-Advanced networks.
Misconception 3: Latency over cellular is hell.
Fact: Although cellular networks are characterized by high latency, organizations can offset latency issues by passing more bytes on each roundtrip. Also, don’t forget that you are using the cellular network to deliver the lag post-disaster, and not in production, so sensitivity to latency is marginal.
Misconception 4: Scalability gets sacrificed with cellular connectivity.
Fact: Cellular networks’ slowly growing bandwidth still poses a challenge with scalability when operating on many databases at once. However, Axxana’s PhoenixOS™ overcomes this challenge by using innovative throttling logic that adapts as needed to utilize limited resources to their fullest.
Misconception 5: Cellular networks are unreliable and prone to packet errors.
Fact: Cellular networks are very reliable—to the point that the U.S. government relies on them rather than wireline networks for emergency services in case of wide-spread disasters.
In addition, large enterprises tend to host a dedicated picocell base station onsite in order to improve cell reception, which can be very effective for non-Armageddon disaster scenarios.
Axxana’s PhoenixOS is optimized specifically for cellular networks, providing unprecedented robustness to ensure successful recovery over cellular networks.
Misconception 6: Cellular networks are not secure.
Fact: Axxana’s PhoenixOS implements industry-standard virtual private network (VPN) connectivity, in accordance with the VPN technology embedded within the customer’s firewall. Phoenix addresses cyber penetration attempts with multiple layers of security ranging from encrypted tunnels and encrypted user names/passwords to built-in firewall software.
To sum it all up, zero data loss and rapid recovery time over cellular networks is feasible and available with Axxana’s cutting-edge Phoenix for Oracle solution. Years of engineering and customer implementation experience allow us to provide a fast, reliable product for the uncharted territory of disaster recovery over cellular lines.
Interested in more info?
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 Disaster Recovery – From Practice to Theory?