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We had 2 problems: 1) We had one mysql query that used three joins. Turns out this function was crashing Mysql. We rewrote this query to use 4 mysql queries without joins and that solved that problem. (Bit of a hot-fix, we will probably rewrite the function so it is possible to cache it). 2) We were experiencing around 99.9 % I/O wait when we only used 10% ...

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