Deduplication explained: A quiz on data dedupe

Take our Deduplication Explained Quiz and learn everything you always wanted to know about data dedupe.

Data deduplication is a way to reduce your storage space by getting rid of redundant data. It is most frequently used in the data backup and recovery space, although primary storage deduplication products are becoming more popular. According to the May 

2010 Storage magazine Purchasing Intensions survey, 40% of respondents hope to increase their spending on data dedupe technologies in 2010. In addition, 23% of respondents currently use data dedupe in their backup operations and 32% plan to add it this year. Without question, data deduplication is one of the hottest technologies in data backup and data storage in the past several years, and it's critical to have a firm understanding of its basics if you're considering using it as part of your data backup strategy.

So whether you're just getting started with learning about deduplication, or you think you know everything about data dedupe, take our deduplication explained quiz. If you got more answers wrong than you hoped for, it's time to hit the books and read our data deduplication tutorial.

1. This technology is the reduction in size of data in order to save space or transmission time. It is sometimes confused with data deduplication. It can be performed on just the data content or on the entire transmission unit.
What is it?

2. This is is the removal of redundancies from data before or as it is being written to a backup device. Critics say it can slow down the overall data backup process because these types of devices are in the data path between the servers and the backup disk systems.
What is it?

3. This is the process of minimizing the amount of data that needs to be stored in a data storage environment. It can increase storage efficiency and reduce costs.
What is it?

4. This type of deduplication removes redundancies from a backup transmission as it passes through an appliance sitting between the source and the backup target. Both intelligent disk targets (IDTs) and virtual tape libraries (VTLs) use this type of deduplication. An advantage of this method is that it allows you to use any backup software that the device supports.
What is it?

5. This type of deduplication can prevent redundant data when backing up data to multiple deduplication devices. With this type of deduplication, when data is sent from one node to another, the second node recognizes that the first node already has a copy of the data, and does not make an additional copy.
What is this?

6. This is the removal of redundancies from data before transmission to the backup target. These types of deduplication products offer a number of benefits, including reduced bandwidth and storage usage. No additional hardware is required to back up to a remote site and many source deduplication products also support automation for offsite copies. On the other hand, this deduplication method can be slower than target deduplication, especially for large amounts of data. Because of the increased workload on servers, overall backup times may increase.
What is this?

7. This technology is also known as asynchronous deduplication. It is the analysis and removal of redundant data after a backup is complete and data has been written to storage. It can be contrasted with inline deduplication, a process in which redundant data is identified and referenced (instead of copied) while the backup is being written.
What is this?

Next Steps

Learn about open-source data deduplication

Watch a video on data deduplication technology

Download our free guide on backup and deduplication

This was first published in June 2010

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