The HPReadData PAT utility is useful in assessing the rate at which your disk subsystem can supply data, and this is ultimately what will limit the backup performance. It simulates the way DP read files. A single instance of HPReadData can read eight streams simultaneously from your array. To read more than eight streams, initiate multiple instances of HPReadData. HPReadData is available for Windows,
Figure 7. HPReadData for Determination of Read Performance
The above screenshot shows HPReadData reading one single LUN in a manner similar to the way a backup application will read files. We can see that the maximum read rate from this configuration is 57 MB/s, so we cannot expect any higher
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