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How can I measure the number of IOPs for a certain query

I need to estimate the max IOPs for a certain MySQL DB (one that does not exist yet). The OS is Linux and the DB is MySQL 5.1.x (though I don't think the DB brand is important for the asked topic) ...
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How to make a consistent database dump with log recording for a later replay on MySQL?

This article explains how to collect MySQL load and how to replay it. My question is how to make a backup on a loaded server in a way that a recorded log will be consistent and not fail during replay ...