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I mostly second this, My personal experience of running a pair of parallel Master-slaves = never a day when it worked right! (v5.0, its improved apparently), just beef up a server to be the master and have slave replication for read/redundancy, if you can scale the read operations then you can get some performance gains, but write should go via the single master for consistencyâ and sanity. chances are if you really have data-io problems your looking in the wrong place, front side caching is probably more optimal, There are multiple strategies and you can tune at a URL + params level, something like 10mins before auto expire can really take a load off. but guessing your hosting and not in control of that. If that's case you might want to investigating throttle strategies to mange load, rather than have your io max out. â if it does add more NICâs - chances are its net IO causing the blocking not the internal IO.
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