HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 21
Deduplication Ratios - user guide
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• Completely transparent to host. • No data is lost - backup streams can be fully restored. • Block or chunk level deduplication, providing greater reduction of data. • Even greater reduction of data when combined with traditional data compression. HP Accelerated deduplication and HP Dynamic deduplication are designed to meet different needs, as shown in Table 2. Table 2 HP Deduplication Solutions HP Accelerated deduplication HP Dynamic deduplication • Intended for enterprise users. • Uses object-level differencing technology. • Fastest possible backup performance. • Fastest restores. • Most scalable solution in terms of performance and capacity. • Potentially higher deduplication ratios. • Intended for mid-sized enterprise and remote office users. • Uses hash-based chunking technology. • Integrated deduplication. • Lower cost and a smaller RAM footprint. • Backup application and data type independence for maximum flexibility. See VLS Accelerated Deduplication and D2D Dynamic Deduplication for more details on HP deduplication technologies. Deduplication Ratios The storage capacity saved by deduplication is typically expressed as a ratio, where the sum of all pre-deduplicated backup data is compared with the actual amount of storage the deduplicated data requires. For example, a 10:1 ratio means that ten times more data is being stored than the actual physical space it would require. The most significant factors affecting the deduplication ratio are: • How long the data is retained. • How much the data changes between backups. Table 3 provides an example of storage savings achieved with deduplication. However, many factors influence how much storage is saved in your specific environment. Based on the retention policies shown below, six months of data without deduplication requires 12.75 TB of disk space. With deduplication, six months of data requires less than 1.25 TB of storage. Retention policy: • 1 week, 5 daily incremental backups • 6 months, 25 weekly full backups Data parameters: • Data compression rate = 2:1 • Daily change rate = 1% (10% of data in 10% of files) HP StorageWorks VLS and D2D Solutions Guide 21