Deduplication Ratios; Hp Deduplication Solutions - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

• 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
Table 2 HP Deduplication Solutions
HP Accelerated 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.
See VLS Accelerated Deduplication
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)
2.
and D2D Dynamic Deduplication
HP Dynamic deduplication
• 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.
HP StorageWorks VLS and D2D Solutions Guide
for more details on HP
21