Source:Deduplication: Difference between revisions
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Revision as of 19:50, 21 July 2016
Copyright © SEP AG 1999-2024. All rights reserved.
Any form of reproduction of the contents or parts of this manual is allowed only with the express written permission from SEP AG. When compiling and designing user documentation SEP AG uses great diligence and attempts to deliver accurate and correct information. However, SEP AG cannot issue a guarantee for the contents of this manual.
Overview
When similar systems are backed up to the same data storage device, there exists the potential for redundancy within the backed up data. However, a data repository only needs to store one copy of the files to be able to restore them.
Deduplication is a data compression technique that eliminates redundant blocks and thus reduces the size of the backed up data by not backing up duplicate data, which results in a reduction in required storage space. SEP sesam applies deduplication technique at block level, and offers a hybrid of both, target-based (Si3T) and source-based deduplication (SSDD) to provide the best possible backup-efficient scenarios for various environments. Both methods require a configured Si3 deduplication store, for which a special license is needed. See List of Licenses for details.
- Si3 target deduplication
- Si3T is an inline, block-level data deduplication solution that writes data directly from the SEP sesam Server or Remote Device Server to the backup media. Backups are deduplicated on the fly as the data is written to the storage target. Since the data redundancies are transferred across the network unreduced and are deduplicated directly at the target, the network load is increased but the storage savings are huge.
SEP sesam analyses blocks of data and determines whether the data is unique or has already been copied to the Si3 repository. Only single instances of unique data are sent to the repository while each deduplicated file is replaced with a stub file. This stub file points to the repository and is used to retrieve stored data. - Source-side deduplication
- SSDD is introduced with SEP sesam version 4.4.3. Source-side deduplication means that data is deduplicated before it is sent across the network, therefore the backup is extremely bandwidth-efficient. During backup, SEP sesam calculates hashes of data to be backed up on the client and then transfers only changed or unknown blocks of the target Si3 dedup store to the backup server.
Note | |
When choosing your deduplication method to eliminate redundant backup data, carefully analyze your existing infrastructure, network constraints and the type of data you want to protect.
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Si3 deduplication can be used together with Si3 replication to provide backup redundacy for disaster recovery and reduce the data transferred over the network.
Tip | |
You can download SEP Tachometer to analyse the structure of your data and calculate potential savings with SEP sesam Si3 deduplication. Check SEP Tachometer. |
What is next?
Configuring an Si3 Deduplication Store – Configuring Source-side Deduplication – Replication