I am trying to add performance monitor to a php application working on a dedicated server and one of the informations I would like to collect is the hard drives load, which, as far as I could find out, can be seen in the %b of iostat -x.

What would be the most reliable way to extract this information with php? I could imagine that I can exec() the iostat -x - but I am not sure about the best way to parse the iostst -x output, so that I get exactly this number. For instance, can I rely that %b is aways the Nth column in the answer? - then I could do it with regex.

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