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Figure 43 Backup Sessions with Duplicate and Unique Data
Item
1
2
3
4
5.
Optional integrity check
If enabled, the optional integrity check runs a byte-for-byte read comparison between the
original tape and the new reassembled version of that tape. This option is disabled by default.
6.
Space reclamation
After the data reassembly creates a new version of the older backup tape, 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:
Install deduplication licenses
Configure the available deduplication options using Command View VLS
A complete backup is necessary to initialize Accelerated deduplication, but data in subsequent
sessions can then be deduplicated. See the HP Virtual Library System user guide for your system
for the complete setup procedures.
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.
Accelerated Deduplication Implementation
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