HP D2D4009fc HP D2D Backup Systems Best practices for VTL, NAS and Replication - Page 76
Tape Offload/Copy from D2D versus Mirrored Backup from Data Source, When is Tape Offload Required?
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Tape Offload/Copy from D2D versus Mirrored Backup from Data Source A summary of the supported methods is shown below. For easiest integration For optimum performance Backup application copy to tape Separate physical tape mirrored backup The backup application controls the copy from the D2D appliance to the network-attached tape drive so that: It is easier to find the correct backup tape The scheduling of copy to tape can be automated within the backup process Constraints: Streaming performance will be slow because data must be reconstructed This is a parallel activity. The host backs up to the D2D appliance and the host backs up to tape. It has the following benefits: The backup application still controls the copy location It has the highest performance because there are no read operations from the D2D appliance Constraints: There are two separate backups on the D2D appliance and tape It requires management if two backup processes and will require the scheduling of specific mirrored backup policies When is Tape Offload Required? Compliance reasons or company strategy dictate Weekly, Monthly, Yearly copies of data be put on tape and archived or sent to a DR site. Or a customer wants the peace of mind that he can physically "hold" his data on a removable piece of media. In a D2D Replication model it makes perfect sense for the data at the D2D DR site or central site to be periodically copied to physical tape and the physical tape be stored at the DR site (avoiding offsite costs) Backup application tape offload at D2D target site 1. Backup data written to Source. D2D 2. D2D low bandwidth replication 3. All data stored safely at DR site. Data at D2D target (written by D2D source via replication) must be imported to Backup Server B before it can be copied to tape. 76