HP D2D D2D Best Practices for VTL, NAS and Replication implementations (EH985- - Page 116
Appendix D, Making use of improved D2D performance in 2.1.01 and, 1.01 software
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Appendix D Making use of improved D2D performance in 2.1.01 and 1.1.01 software Overview HP StoreOnce D2D software released in February 2011 includes significant performance stabilization updates that reduce the disk access overhead of the deduplication process and therefore improve overall system performance. However this performance improvement only applies to D2D virtual devices (NAS Shares and VTLs) created after updating to the new software. Older devices will continue to work in the same way as they did prior to the update and if performance is acceptable then there is no need to make any changes. If improved performance is required then there are three main options for making use of the new functionality whilst retaining previously backed up data: 1. Retire existing libraries and shares, create new ones and re-direct backups to them. Once backup sessions to the retired libraries/shares are obsolete (i.e. outside of retention policies) they may be deleted. 2. Replicate data to new libraries/shares on a different D2D appliance, create new devices on the original appliance then replicate the data back. This method is termed ―Replication for Virtual Device Migration‖. 3. Replicate data to new libraries/shares on the same D2D (self replicate), delete original devices and re-target backups to the new devices once replication is complete. This method is termed ―Self Replication for Virtual Device Migration‖. This document provides detailed information on implementing options 2 and 3. Option Option 1 Retire original libraries Option 2 Replication Option 3 Self Replication Benefit Limitations No migration time required Needs enough disk space and available virtual devices to store two copies of data Makes use of a standard replication configuration Easy to implement if a ―floating‖ D2D is used and co-located on the same site The same library and share names can be re-used Requires no additional hardware or licenses Some migration time required to perform replication when backups cannot run Requires 2 D2D systems and a replication license Needs enough disk space to store two copies of data Complex if replication is already being used Some migration time required when backups cannot run 116
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