HP StorageWorks 12000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028 - Page 154

space by deleting cartridges. In the 3.2 firmware this is disabled in the GUI, so use the VLS CLI to perform this. NOTE: Use only the CLI cartridge delete option to delete non-deduplicated cartridges. After deduplication is successfully enabled, ensure virtual cartridges are created correctly for optimum deduplication performance and for correct backup capacity: • If you are creating new cartridges for deduplication, then sizing should be 50-100 GB up to 300 GB maximum (see Media Management ). If you are sizing cartridges for a VLS that has existing backup data created when the VLS was running 2.x firmware, the Storage Pool created by the 2.x firmware has lower cartridge limits. You should size the virtual cartridges to at least 100 GB or larger. • If you already have existing non-deduplicated cartridges that exceed these cartridge sizing requirements, you must resize these existing cartridges to match the deduplication requirements. This will not affect any existing backup data until the next backup is performed to the resized cartridge. • Because deduplication automatically enables cartridge oversubscription, you can create more virtual cartridge capacity than the available physical disk capacity (the deduplication will reduce the amount of physical disk used on the virtual cartridge backup data by eliminating duplicate data). Only create the amount of virtual cartridge capacity that you need for your backup retention policy (see Tape Oversubscription). This means you need to ensure you create enough virtual library slots to contain the oversubscribed set of virtual cartridges. For existing virtual libraries that do not have enough slots, you must modify the existing virtual library to increase the number of slots (either delete/recreate the virtual library with more slots or contact your HP support representative for assistance in expanding the existing virtual library). • Remember to update the backup application library configuration to detect any new library slots and new virtual cartridges. • Use shared media pools (i.e., share the media across backup policies/names and across media servers). See Media Management . • Review Detailed Backup Application Guidelines for VLS for backup application-specific deduplication guidelines such as setting 256 KB tape record size, etc. A complete backup is necessary to initialize Accelerated deduplication, but data in subsequent sessions can then be deduplicated. See the HP StorageWorks Virtual Library System user guide for complete setup procedures. See Migrating your Existing Backup Data for details on how to handle existing non-deduplicated backup data. After deduplication has been running for multiple full backup cycles, you can check the deduplication reports to see how effectively it is running; see Configuration and Reporting. Deduplication configuration options are available through Command View VLS to allow optimization of file server deduplication (see Optimizing File Server Deduplication) or handling backup application-specific data type configurations (see ???). Licensing Accelerated deduplication is a licensed feature. Licenses are based on the physical disk capacity of the VLS device. You must install enough deduplication licenses for all disk LUNs. NOTE: You cannot license a partial configuration. The entire capacity of the device must be licensed. 154 Virtual Library Systems