Dell DR4000 Administrator Guide - Page 14
Replication, storage space. - encryption
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FILE LOCATION: C:\Users\bruce_wylie\Desktop\Dell Docs\~Sidewinder_Docs_DR4000\FRAME_Conversion_DR4000_AdminGuide\~DR4000_AG_F By contrast, standard file compression tools identify short repeated substrings inside individual files, with the intent of storage-based data deduplication being to inspect large volumes of data and identify large amounts of data such as entire files or large sections of files that are identical. Once this has been done, this process allows for the system to store only one copy of the specific data. This copy may be additionally compressed using single-file compression techniques. For example, there may be cases where an email system may contain 100 or more emails where the same 1 megabyte (MB) file is sent as an attachment and the following shows how this is handled: • Without data deduplication, each time that email system is backed up, all 100 instances of the same attachment are saved, which requires 100 MB of storage space. • With data deduplication, only one instance of the attachment is actually stored (all subsequent instances are referenced back to the one saved copy), with the deduplication ratio being approximately 100 to 1). NOTE: The DR4000 system does not support deduplication of any encrypted data, so, there will be no deduplication savings derived from ingesting encrypted data. The DR4000 system cannot deduplicate data that has already been encrypted because it considers that data to be unique, and as a result, cannot deduplicate it. Replication Replication is the process by which the same saved data is saved from multiple storage devices, with the goal of maintaining consistency between redundant resources in data storage environments. Data replication improves fault-tolerance, improving the reliability of maintaining saved data, and permitting accessibility to the same stored data. The DR4000 system uses an active form of replication that lets you configure a primary-backup scheme in which the system processes data storage requests from a specified source to a specified destination or replica. NOTE: It is important to distinguish the difference between data that has been processed by backup and data that has been processed by replication, since backup saves a copy of data that remains unchanged for a long period of time. DELL CONFIDENTIAL - PRELIMINARY 1/10/12 - FOR PROOF ONLY 6 Understanding the DR4000 System