D2D Dynamic Deduplication; How It Works - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

• Limited to EVA & XP & LHN (future)
• Snapshots could take up large amount of EVA and XP space depending on frequency of snapshots
at extra cost.
• Note that to do the ZDB backup of VM volumes it is a requirement that the VM volumes use the
VMware raw device mappings (RDM) feature.
Other information:
A simple two step backup for complete protection:
• VM Backup
• Data Protector Integration with VMware VCB provides the first layer of protection.
• Provides snapshots that can be used for restoring VM.
• Needed only when VM configuration changes.
• Application Backup
• Provides the second layer that enables protection of application data.
• Can be performed using ZDB/IR feature of Data Protector by using HP Business Copy for EVA,
XP ( LHN to follow).
Further enhancements possible by providing multi-site disaster recovery by using low bandwidth
replication on HP D2D devices.

D2D Dynamic Deduplication

HP Dynamic deduplication technology is designed around compatibility and cost for users with smaller
IT environments. It offers the following features and benefits:
• Uses hash-based chunking technology, providing deduplication technology at a lower cost.
• Operates independently of backup format, avoiding issues with backup application support.
• Automatic and manageable.
Configuring Dynamic deduplication is simple. There is no need to tell the deduplication software
which backup application you are using or where file markers are. Dynamic deduplication works
with any backup application and with any data type.
See http://www.hp.com/go/ebs
recommended for use with Dynamic deduplication.

How it Works

Dynamic deduplication uses hash-based chunking technology, which analyzes incoming backup data
in "chunks" that average to 4K in size. The hashing algorithm generates a unique hash value that
identifies each chunk, and points to its location in the deduplication store.
NOTE:
Using small sections of about 4K in size allows the Dynamic deduplication software to locate a greater
number of instances of duplicated data. With smaller chunks of data, more hash values are generated
and compared against each other. If larger chunks of data are analyzed, and a pattern does not
repeat within of the boundaries of the chunk, the duplication is not caught.
for more information on backup applications and data types
HP StorageWorks VLS and D2D Solutions Guide 69