HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 98

Replication, How it Works

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7 Replication The VLS deduplication-enabled replication technology (which leverages Accelerated deduplication) is designed to maintain performance and scalability to meet the needs of enterprise data centers: • On a multi-node VLS device the replication is also multi-node capable and thus can scale as the device scales. • Fast restore performance is preserved on the replicated cartridges on the target device by maintaining the most recent full backup as a complete copy and then deduplicating the older backup cartridges (just like the source device). • Optimized post-process architecture means that the deduplication analysis of new backup data is only run once (on the source) and the results from this are used for the space reclamation on the source device, the replication delta transfer, and the space reclamation on the target device. How it Works The HP VLS Accelerated deduplication is the key technology enabler for replication. Understand where replication fits into the post-processing deduplication architecture: Figure 44 How Replication Fits into the Deduplication Architecture 1. As the backup takes place, a metadata database is created. 2. Using the metadata compiled in step 1, the deduplication software running on the VLS nodes identifies which backups to compare against which similar backups in order to remove duplicate data. 3. Once the backup job is finished and the tape (which does not need to be full) is unloaded, the system compares the current backup with previous backups identified in step 2. Identifying the differences typically takes about the same length of time as the backup. 4. Once the differences are identified, the backup on the source begins to replicate. The deltas (changes) are sent across the TCP/IP replication link. The space reclamation of the previous 98 Replication

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7 Replication
The VLS deduplication-enabled replication technology (which leverages Accelerated deduplication)
is designed to maintain performance and scalability to meet the needs of enterprise data centers:
•
On a multi-node VLS device the replication is also multi-node capable and thus can scale as
the device scales.
•
Fast restore performance is preserved on the replicated cartridges on the target device by
maintaining the most recent full backup as a complete copy and then deduplicating the older
backup cartridges (just like the source device).
•
Optimized post-process architecture means that the deduplication analysis of new backup
data is only run once (on the source) and the results from this are used for the space reclamation
on the source device, the replication delta transfer, and the space reclamation on the target
device.
How it Works
The HP VLS Accelerated deduplication is the key technology enabler for replication. Understand
where replication fits into the post-processing deduplication architecture:
Figure 44 How Replication Fits into the Deduplication Architecture
1.
As the backup takes place, a metadata database is created.
2.
Using the metadata compiled in step 1, the deduplication software running on the VLS nodes
identifies which backups to compare against which similar backups in order to remove duplicate
data.
3.
Once the backup job is finished and the tape (which does not need to be full) is unloaded,
the system compares the current backup with previous backups identified in step 2. Identifying
the differences typically takes about the same length of time as the backup.
4.
Once the differences are identified, the backup on the source begins to replicate. The deltas
(changes) are sent across the TCP/IP replication link. The space reclamation of the previous
98
Replication