The hIOmon software does provide an option to collect I/O trace and/or summary metrics during the system boot/start process.
This can get a bit tricky given, for instance, the volume of I/O operation activity that generally occurs during the system boot/start - along with the mechanics required to collect the requested metrics while the system itself is not fully operational yet.
If you would like to pursue this, please see the "Boot Logging" section (starting on page 68) and section "7.5 Boot Logging" within the "hIOmon User Guide" document.
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