Accelerated Deduplication Implementation; Backup Sessions With Duplicate And Unique Data - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

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Figure 68 Backup Sessions with Duplicate and Unique Data
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5. Optional integrity check
comparison between the original tape and the new reassembled version of that tape. This option
is disabled by default.
6. Space reclamation
the original tape is deleted, freeing up disk blocks. The new version of that tape is renamed to
the same barcode as the original tape.
NOTE:
A tape must be full before reclamation of its data will occur.

Accelerated Deduplication Implementation

The following must be performed to implement Accelerated deduplication:
• Upgrade from 4 GB to 16 GB RAM per VLS node
• Upgrade to firmware version 3.1.2 or higher
152 Virtual Library Systems
Description
Backup session 1 consists of files A and B.
Duplicate data from A is replaced with a pointer to A'. The unique data from file A, as
well as file B in session 1 one is retained.
The pointer from A to A' is readjusted to point to A" in session 3, the most recent instance
of that data.
Pointers are placed from files A' and C in session 2 to A" and C' in session 3.
If enabled, the optional integrity check runs a byte-for-byte read
After the data reassembly creates a new version of the older backup tape,