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flush-8:0 is kernel thread, works on flushing dirty RAM buffer and/or swap to disk, jbd2/sda2-8 is kernel thread, that is working with journaling on filesystems - they're intensive IO are results, not reasons of your problem. more looks like your problem is heavy usage of disk by mysql. while JBD is in use - looks like multiple write operations are in ...


The answer turned out to be the answer to a related question I asked about which device to change the scheduling settings on. Long story short, this server has its devices configured as multipath for some reason, and that means you don't change the scheduler on /dev/sdc, but on /dev/dm-1 (in my case). The results speak for themselves, machines are no longer ...

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