HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 152
Accelerated Deduplication Implementation, Backup Sessions with Duplicate and Unique Data
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Item 1 2 3 4 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. Figure 68 Backup Sessions with Duplicate and Unique Data . 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: • Upgrade from 4 GB to 16 GB RAM per VLS node • Upgrade to firmware version 3.1.2 or higher 152 Virtual Library Systems