HP D2D D2D Best Practices for VTL, NAS and Replication implementations (EH985- - Page 86

Number of parallel backup streams will determine overall throughput. The backup specification says Filesystem1 has 3 mount points which allows us to run 3 parallel backup streams. Sites A and D are identical so we can specify 2 identical sites IT IS VERY IMPORTANT that when you are creating the backup specifications in the Sizer tool you pay particular attention to the Field "Number of parallel Backup Streams‖. This field determines the backup throughput and the amount of concurrent replications that are possible BUT it may require a conscious change by the customer in backup policies to make it happen. A single backup stream (1) to a D2D device may run, for example, at 30 MB/sec but running three streams simultaneously to a D2D will run at say 80 MB/sec. The Sizer has all these throughputs per stream modeled with actual numbers from device testing. So, for best throughput, HP recommends four streams or more. What this means in practice is re-specifying backup jobs to use separate mount points. For example, instead of backing up ―Filesystem1‖ spread across drives C, D, E on site A, create three jobs C:/Dir1, D:/Dir2, E:/Dir3, so that we can run three parallel backup streams. 86