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Demystifying Deduplication
What is deduplication?
Deduplication eliminates redundant copies of data
by leveraging pointers to point duplicate files or
blocks to a single object
APPROACH:
Eliminate redundant
data
Maintain references to
single instances of
data across data store
Start with the backup
environment as the
first phase
Deduplication can decrease disk capacity requirements
by up to 98% and decrease bandwidth requirements for data
transfer by up to 50 times.
2
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Dell’s point of view on deduplication
• Data Deduplication is a capacity optimization
feature – not a capacity optimization solution
 Need to understand what problem you are trying to fix
 Dell can help find the right solution to your storage
challenges
• As deduplication matures it will be ubiquitous
across a wide range of storage products
• Deduplication integrated into software functionality
provides the greatest benefits
 Need to understand what problem you are trying to fix
 Dell can help find the right solution to your storage
challenges
• Deduplication technology will expand beyond
backup to include static archive data and inactive
primary data
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Deduplication – Confusion abounds
Different Architectures
File
Post
Processing
Inline
Processing
Different technologies
Source
VTL
Block
Sub-block
Target
Single
Instance
Storage
Types of deduplication
Data object #1
A BCD
Data deduplication eliminates
common data at a file, block,
or sub-block level.
• aka Single Instance
Store or SIS
• Typically primary
storage
5
Unique data saved to disk
Sub-block
• aka Sub-file or Fixed
block
• Typically secondary
storage
• Better dedupe ratios
Disk Capacity
ABCE F
ABCDE F
Block
File
Data object #2
• aka Variable block
or Byte-level
• Typically secondary
storage
• Best dedupe ratios
• Most processor
intensive
Required
6
Deduplication
Enables Cost Effective Disk To Disk Backup
Backup to Disk with Dedupe
Primary
Disk
Secondary
Disk
Shorten backup window and
restore faster with B2D – At a cost
similar to tape
Reduce storage capacity, power,
cooling and space requirements
Replication
Backup
Archive
Centralize data protection and
archive, reducing the burden on
offices not staffed to manage it
Deduplication
Enable cost-effective DR
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Why optimize disk-based backup
with deduplication?
Total capacity
needed after 3
years (TB’s)
# drives needed
Total storage cost
1.
2.
B2D without
deduplication
B2D with
deduplication
10:1 ratio
34.6
3.46
36
5
~$34k
~$8k
Example – 20TB of data growing 20% per year
How long until the deduplicated storage capacity required equals
3 years without dedupe?
 Just over 15 years
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How deduplication fits into the
backup environment
Application Servers
Deduplication JBOD/NAS/SAN
Appliance
Backup Server
OR
Deduplication
Deduplication
Deduplication
Here
or
here
Server-based (Source)
& Integrated (Hybrid)
Advantages:
• Common management
• Ease of use
• Can be less expensive solution (lower TCO)
• Reduces network traffic
• Global deduplication opportunity
8
or
here
Appliance-based (Target)
Advantages:
• Ease of implementation
• Works with variety of backup SW
Disadvantages:
• Can be more expensive solution
• Replication target restrictions
• Greater network traffic overhead
• Often on proprietary hardware
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