HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 15

Deduplication Ratios, Table 2 Accelerated Deduplication

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HP Accelerated deduplication and HP Dynamic deduplication are designed to meet different needs, as shown in Table 2 (page 15). 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 "Accelerated Deduplication" (page 87) for more details on the HP deduplication technology. 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 (page 16) 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) Deduplication 15

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HP Accelerated deduplication and HP Dynamic deduplication are designed to meet different needs,
as shown in
Table 2 (page 15)
.
Table 2 HP Deduplication Solutions
HP Dynamic deduplication
HP Accelerated deduplication
•
Intended for mid-sized enterprise and remote office
users.
•
Intended for enterprise users.
•
Uses
object-level differencing
technology.
•
Uses
hash-based chunking
technology.
•
Fastest possible backup performance.
•
Integrated deduplication.
•
Fastest restores.
•
Lower cost and a smaller RAM footprint.
•
Most scalable solution in terms of performance and
capacity.
•
Backup application and data type independence for
maximum flexibility.
•
Potentially higher deduplication ratios.
See
“Accelerated Deduplication” (page 87)
for more details on the HP deduplication technology.
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 (page 16)
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)
Deduplication
15