HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 91

Accelerated Deduplication Implementation, Backup Sessions with Duplicate and Unique Data

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Figure 43 Backup Sessions with Duplicate and Unique Data Item Description 1 Backup session 1 consists of files A and B. 2 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. 3 The pointer from A to A' is readjusted to point to A" in session 3, the most recent instance of that data. 4 Pointers are placed from files A' and C in session 2 to A" and C' in session 3. 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. Accelerated Deduplication Implementation 91

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Figure 43 Backup Sessions with Duplicate and Unique Data
Description
Item
Backup session 1 consists of files A and B.
1
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.
2
The pointer from A to A' is readjusted to point to A” in session 3, the most recent instance of
that data.
3
Pointers are placed from files A' and C in session 2 to A” and C' in session 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.
Accelerated Deduplication Implementation
91