Figure 33. Backup to Ultrium 960 - Average CPU Utilization with 64 KB Block Size
Figure 34. Backup to Ultrium 960 - Average CPU Utilization with 256 KB Block Size
These results confirm the block size recommendation of the Ultrium 960 white paper “Getting the most performance from your HP StorageWorks Ultrium 960 tape drive white paper” (downloadable from http://h18006.www1.hp.com/storage/tapewhitepapers.html).
For the typical file backup, the single Ultrium 960 tape drive showed a lower CPU utilization (11%) than double SDLT 320 tape drives (16%). Additionally, the Ultrium 960 showed also a better transfer rate (91,97 MB/s instead of 62,87 MB/s). This and other tests demonstrate that single high- performance tape drives require less CPU resources with the same or even better transfer rate. Please check Table9 and Table11.
Advanced Backup to Disk
The Advanced Backup to Disk performance relies basically on the disk arrays and tape drives – source and target. It must be taken into consideration that the MSA1500 provides less performance than the MSA1000 and both less than one Ultrium 960 tape drive. Please note that the MSA1500
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