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Containers Expo Blog: Article

Affordable Replication for Both File and Block Storage

It’s attainable for midsize organizations

Data is the lifeblood of any organization and, in the last decade, increasing emphasis has been placed on protecting that data so organizations can recover the information that they need in the time frame they need it. Replication is now rapidly emerging as a viable form of data protection even for midsize organizations because of its lower costs, faster recovery times and the level of protection that it provides. However the process of selecting the right replication solution for the different data types that organizations need to protect is anything but an intuitive exercise.

Replication in its simplest form is a copy of production data that is stored somewhere else on disk. Then if the production data becomes corrupted, destroyed or inaccessible, a copy of that data can be quickly accessed to minimize or even eliminate a disruption in service to the application or end-user. In addition to being used for data protection or disaster recovery, replication can also be used to provide a secondary copy of data for testing and/or analysis.

Due to continuing declines in the cost per GB for disk, coupled with the availability of higher bandwidth and lower cost WAN connections, replication is becoming a viable option for almost any midsize organization. Unfortunately these organizations are often put in a position where they must make trade-offs as to what types of data they can afford to replicate.

Selecting the right replication process is challenging as several different methods of replication exist. One common method of replication is file-based replication, of which there are at least two forms. If all an organization wants to protect is a few folders and/or files on an NFS file share, then a simple Linux utility such as rsync will do the job quite nicely as it copies files from one file server to another. On the other hand, if an organization wants to accomplish the same thing on a Microsoft Windows file server, then the distributed file system (DFS), a built-in feature of Microsoft Windows, will suffice.

However storage systems can also perform what is known as block-based replication. Block-based replication can occur between two physically separate storage systems as well as in the form of snapshots or mirrors which are copies of production data made internally on disk on the storage system.

The advantage of block-based replication is that it does not care what protocol or file system (NFS, CIFS, ext3, xfs, NTFS, etc.) an applications uses. It operates below the file system stack and replicates raw blocks of data irrespective of the file system that sits above it. This method is most often used for replicating application databases where the file system replication is not the best choice.

Here is where the problem comes in for midsize organizations. They may want to introduce replication into their environment to take advantage of its benefits as a data protection solution or as a tool for testing and/or analysis. However it is also possible that they have a need for both forms of replication: file-based (protecting data on NFS and CIFS shares) as well as block-based (creating a less-expensive second shelf behind primary storage), for local and remote disaster recovery and/or for higher availability. But to purchase two or three separate storage systems that support each of these different types of replication is beyond what midsize organizations can pay.

This is where a storage system such as the RELDATA 9240i Unified Storage solution comes into play as the 9240i supports both file-based and block-based replication. This enables an organization to choose a single storage solution to meet these disparate replication requirements. In addition, the RELDATA solution uses iSCSI for replication, which is a less expensive alternative to costly fibre channel switches and cables, and leverages existing resources.

The 9240i uses iSCSI to support replication over a regular TCP/IP connection and can do either synchronous or asynchronous replication. Configured for synchronous replication, organizations can use the 9240i to mirror critical data over a short distance. In this fashion, primary and secondary copies of data can be kept in lock-step with each other and provide real-time copies of data in two locations for high availability of applications utilizing file or block based data. The failover is instantaneous, enabling a zero RPO/RTO when either side of the mirror is lost, along with fully-automatic, non-disruptive incremental failback.

If an organization is looking to provide a disaster recovery solution at a remote location, the 9240i also supports asynchronous replication. Used this way, midsize organizations can replicate either their file- or block-based data to one or more remote locations without needing multiple storage solutions. Incremental replication dramatically reduces RPO compared with traditional backup solutions. Since remote copies are ready for production deployment immediately, the organization can enjoy a near-zero RTO in the event of contingency. Asynchronous replication can also be combined with synchronous mirroring to deliver a comprehensive DR solution.

Replication is a powerful new tool that was once the exclusive domain of enterprise organizations that had big budgets, big data centers and lots of IT staff to manage it.

Not anymore.

Now, using iSCSI-based unified storage solutions like the RELDATA 9240i, not only do midsize organizations have access to affordable replication services replication, they can extend the benefits of replication to more data types (file and block) than what most solutions intended for the enterprise can typically provide, and do so at a fraction of the cost.

By Jerome Wendt and David Stevens

More Stories By Joe Austin

Joe Austin is Vice President, Client Relations, at Ventana Public Relations. He joined Ventana PR in 2006 with more than 14 years experience in high-tech strategic communications. His media relations experience spans both broadcast and print, and he maintains longstanding relationships with editors and reporters at business, IT, channel, and vertical publications. Austin's relationship with the media includes marquee outlets including CNN, BusinessWeek, USA Today, Bloomberg, and the Associated Press for clients ranging from startups to billion-dollar enterprises. Experience includes working with Maxell, McDATA (Acquired by Brocade), Center for Internet Security, Securent (Acquired by Cisco), Intrepidus Group/PhishMe, FireEye, Mimosa Systems, Xiotech, MOLI.com, EMC/Rainfinity, Spinnaker Networks (Acquired by NetApp), ONStor, Nexsan, Asigra, Avamar (Acquired by EMC), BakBone Software, Dot Hill, SANRAD, Open-E and others. With more than a decade of strategic planning, media tours, press conferences, and media/analyst relations for companies in the data storage, security, server virtualization, IT outsourcing and networking arenas, Austin's domain expertise assists in positioning clients for leadership. Austin was recently recognized as a “Top Tech Communicator” for the second year in a row by PRSourceCode. The editorial community – represented by more than 300 participating IT journalists – rated each winner based on best overall performance and recognized those who added the most value to their editorial processes in terms of responsiveness, reliability, and overall understanding of editorial needs.

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