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@ewwhite, you've provided the answer to a question the op didn't ask. The answer to "change permanently the I/O scheduler for a specific disk" is not provided at the resource you suggested, and the comment "the way Fedora and Red Hat documented and intended" is off-base for several reasons that I won't get into here. To change the io scheduler for a ...


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Take pt-ioprofile and check, what mysql is reading and writing. http://www.percona.com/doc/percona-toolkit/2.1/pt-ioprofile.html


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I've also experienced a similar problem right before a disk in a RAID failed and some SATA cables with tight bends in them started failing. The CPU usage was near 0%, but 1 or more CPU's on a 4-core system were spending 100% of their time in IOwait for extended periods of time (found via top multi-line cpu display) with very low IOps and bandwidth (found ...


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I suppose that when you're serving low number of clients then your server is able to cache most of needed data in RAM, so it is serving it almost exclusively from RAM. But when more and more clients are served most of data does not fit to your RAM and your server needs to read it from your IO subsystem. Cache is much less used, as most of the time needed ...


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What about create a ramdisk and putting content there? You can run rsync to backup the data to physical disk and prevent data loss.



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