HP Data Protector Software Performance White Paper

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Evaluating tape and disk drive performance
The performance test of tape and disk drives gives a good overview of what the source and
target devices are able to provide. Backup applications cannot perform better than these basic
tools.
Tape write and read performance
The tape drive performance was determined with the HP StorageWorks Library and Tape Tools
Diagnostics (L&TT).
L&TT for Windows was configured for writing and reading:
• Zeros with fixed block mode, 256 KB block size, 1M I/O size, 32 GB test size and no file
marks
• 2:1 compressible data with fixed block mode, 256 KB block size, 1M I/O size, 32 GB test size
and no file marks
Figure 23 illustrates the L&TT for Windows input parameters and Figure 24 some test results.
Figure 23. Library and Tape Tools Diagnostics for Windows – input parameters