Pro+ Content/Storage magazine

Thank you for joining!
Access your Pro+ Content below.
Vol. 6 No. 7 September 2007

Understanding dedupe ratios

Data deduplication ratios are related to the number of changes occurring to the data. Each percentage increase in data change drops the ratio; the commonly cited 20:1 ratio is based on average data change rates of approximately 5%. Vendors assume that compression will reduce deduplicated data by a factor of 2:1. If the deduplication ratio were 15:1, for example, compression could increase that ratio to 30:1. But users with large amounts of data stored in compressed formats, such as jpeg, mpeg or zip, aren't likely to realize the extra bump compression provides. The length of time data is retained will affect reduction rates. To achieve a ratio of 10:1 or 30:1, you may need to retain and deduplicate a single data set over a 20-week period. If you don't have the capacity to store the data for that long, the data-reduction rate will be lower. Lastly, full backups give deduplication software a more granular view into the backup, so more frequent full backups will achieve higher ratios. --Jerome M. Wendt For the full feature go to ...

Access this Pro+ Content for Free!

By submitting you agree to recieve email from TechTarget and its partners. If you reside outside of the United States you consent to having your personal data transferred and processed in the United States. Privacy Policy

Features in this issue

  • Fast CAS facts

  • Backup and archiving get closer together

  • How SANs aid backup

    by  Bradley Hughey

    The primary motivation for building a SAN is often to meet a pressing need for performance, scalability or both. But today's new SAN buyers are looking for more than performance and scalability; they're interested in better ways of protecting their data, using such techniques as snapshots of SAN volumes and sometimes even relying on newer technologies to replace traditional backups.

  • Protect Exchange data

    by  Jerome Wendt

    Email is now firmly established as a critical application, with more than 60% of enterprises using Microsoft Exchange for their corporate email, according to Gartner. This widespread adoption of Microsoft Exchange, and growing electronic discovery requirements, make protecting it a more complicated proposition than just performing simple backups and recoveries.

  • New role for tape libraries

    by  Jerome Wendt

    Tape libraries are finally assuming the role they were designed for: longterm protection and preservation of data. But as disk assumes its new role as the initial target for backups and the source for restores, tape library vendors need to shore up their abilities to interact with disk libraries and provide users with some definitive answers on encryption.

  • Understanding dedupe ratios

    by  Jerome Wendt

Columns in this issue

  • Editorial: Backing up garbage

  • Storage Bin: Who ate the backup?

    It's astounding that in this age of technological advancements we still talk about things like backup, let alone agonize over it.

  • Best Practices: Sorting out remote-office backup

    Remote-office data has always been something of a corporate orphan when it came to backup. Once upon a time, "out of sight, out of mind" might have worked, but times have changed. Regulatory compliance, legal liability issues and the cost of producing data for ediscovery make it clear remote data can no longer be ignored.

  • Best Practices: Pull the plug on high energy costs

    by  Dianne McAdam

    Spiraling energy costs are taking an increasingly big chunk of the data center budget. Data centers are grappling with rising electrical bills and, in some locations, limitations on the amount of available power are forcing IT anagers to rethink their basic processes.

  • Hot Spots: Managing storage in a virtual server world

    Server virtualization is the big data center story, and storage managers need to design their storage systems to take advantage of a virtualized server environment. There are steps you can take now to ensure that your storage systems are up to the task.

SearchSolidStateStorage

SearchVirtualStorage

SearchCloudStorage

SearchDisasterRecovery

SearchDataBackup

-ADS BY GOOGLE

Close