HP Data Protector Software Performance White Paper

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Figure 47 illustrates the performance of a local backup to the Ultrium 960 tape drive with
different concurrencies. It shows that a Ultrium 960 concurrency value of three was sufficient for
this test environment with the SAN-connected disk volumes. The default value of four or the
higher value of five did not improve performance but did also not degrade it. Higher values for
concurrency are useful for environments with slower disks and file systems.
Figure 47. Performance of HP-UX local backup to Ultrium 960 with concurrency 1 - 5
Concurrency 1 - 5
Performance of HP-UX Local Backup to Ultrium 960
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Concurrency
MB/s