Focus on Shadowbase Product Management

Keith B. Evans

Keith B. Evans Shadowbase Product Management

HPE Shadowbase Synchronous Replication

Shadowbase asynchronous data replication provides excellent levels of business continuity protection, especially when deployed in sizzling-hot-takeover (SZT) or active/active architectures. However, not all applications are suitable for an active/active solution, and all asynchronous replication architectures suffer from the potential for data loss. What is the solution for business services where data collisions and/or loss of any data cannot be tolerated? The answer is synchronous replication!

With synchronous replication, application data changes are not committed (made visible and permanent) unless the changed data has also been saved to a backup system. This process guarantees that no data is lost in the event of an outage; therefore, the costs arising from data loss simply do not occur with synchronous replication.

Additionally, in a synchronous active/active environment, it is not possible for data collisions to occur, because the updated data records are locked on both systems before any changes are committed on either system. The same simultaneous update situation is instead manifested as a transaction deadlock (caused by a distributed lock collision), which is easily resolved by the data replication engine. Thus, no data inconsistency occurs.

Synchronous replication should be utilized for the highest levels of availability with zero data loss (ZDL) and no data collisions. Here is the good news: HPE Shadowbase ZDL supports synchronous replication. A new release of this product will be coming soon that provides ZDL for uni-directional active/passive architectures as well as support for bi-directional SZT and active/active architectures. Later, we plan to release a new product (HPE Shadowbase ZDL+) that will extend the ZDL capability and eliminate data collisions in an active/active environment. Gravic is excited and proud to bring this new technology to market after a long time in development and the implementation of many novel and patented techniques. We thank our HPE development colleagues for working with us and providing supporting TMF RFE’s.

We are also pleased to announce additional features in our support for replicating NonStop Enscribe to SQL databases, for example to eliminate the “data silo” problem, as well as a new Repair feature for our HPE Shadowbase SQL Compare utility, which is useful to verify that two databases are in sync and to repair them when not. Please visit our Shadowbase Development News section for more information on these useful additions.

Changing the subject, as you all know, HPE licenses and supports Shadowbase software under the HPE umbrella. This relationship benefits our customers by placing HPE’s huge resources at your service, globally, 24x7x365, including HPE support, sales, technical analysts, and professional services teams. Gravic personnel have been engaged in several “HPE Partner Technical Update” (PTU) sessions to fully leverage this great benefit. At these sessions, HPE sales and support personnel learn about the many capabilities of Shadowbase solutions, and jointly develop ways in which we can more effectively work together. So far, PTU sessions have been held in the USA, Europe, Southeast Asia, and Central/South America, with more planned for the coming year. The more that HPE personnel learn about Shadowbase software, the more our customers will benefit from this partnership.


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