HP D2D Manuale Utente Scaricare il pdf (Pagina 86)

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.

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

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HP D2D Manuale Utente Pagina 86