HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 156

Delta-diff in Process - the backup has identified another version of itself to difference against and is now running differencing to identify the duplicate data between the two versions. With multi-stream backups, this process may take multiple tries (going back to "Waiting for Next Backup" state each time) until the differencing locates the correct stream. Pending Reclamation - the differencing is complete (duplicate data has been identified) and space reclamation is now waiting for full cartridges before it can begin. Partially Reclaimed - in a backup job that spanned multiple cartridges, the full cartridges have been space reclaimed but the last tape in the spanned set (which is partially full) is waiting until that tape is full before it can reclaim space. Dedupe Complete - deduplication, including all space reclamation, is complete for this backup job. No Match Found - indicates backups that cannot be deduplicated because they were unable to match with their previous version due to large-scale modification. In the detailed Backup and Cartridge reports, the "Dedup Ratio" represents an estimate of the overall compression ratio (including both deduplication and compression) of that backup/cartridge based on the amount of logical backup data stored versus the amount of physical disk space used. If the backup job status is "Waiting for next backup,""Delta-diff in Progress," or "Pending Reclamation," the ratio will only include the compression because deduplication will not have actually space reclaimed that tape and therefore will not have saved any disk space. If the status is "Partially Reclaimed" or "Dedupe Complete," the backup disk space has been partially or fully reduced by deduplication and the ratio represents compression plus deduplication. The "Physical Size" value in GB follows the same logic. Use the System Capacity report to see how much disk space is saved by deduplication. The physical used space will vary as deduplication creates temporary working data and then eliminates the duplicate data. Handling the Device Out of Capacity Condition In VLS firmware version 3.3.0, there is a graceful shutdown of backup services in the VLS when the device reaches 98% full disk capacity. Tthis ensures that there is no loss of data access when the storage capacity is full. The VLS will reject all attempts to write data from the backup application at 98% full capacity, so you must reformat/erase unnecessary cartridges via the backup application to free storage. All read operations will remain unaffected so you can still restore existing backups on the device or copy backups to tape prior to reformatting them to free up disk space. Follow the recommended sequence to free up disk space when the device is full: 1. Use the VLS GUI to generate a Cartridge Utilization report (via Notifications Report Setup). This report lists the barcode of each cartridge, disk space usage in bytes, deduplication status, and dependent cartridges (if any) which can be used to identify the cartridges that you can reformat/erase to create free storage. For example, first reformat/erase cartridges that are consuming a considerable amount of space and are expired, and then reformat/erase non-deduplicated cartridges which have no or few dependent cartridges. When reformatted/erasing non-deduplicated cartridges, the disk space is only freed up if dependent cartridges are also reformatted/erased. 156 Virtual Library Systems