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Cake day: August 6th, 2023

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  • Hmm, at a glance those all look to be CMR.

    To rule this out ideally, a tool like iostat (part of sysstat tools) can help. While moving data, and with the problem happening, if you run something like “iostat 1 -mx” and watch for a bit, you might be able to find an outlier or see evidence of if the drives are overloaded or of data is queueing up etc.

    Notably watch the %util on the right side.

    https://www.golinuxcloud.com/iostat-command-in-linux/ can help here a bit.

    The %util is how busy the communication to the drive is… if maxed out, but the written per second is junk, then you may have a single bad disk. If many are doing it, you may have a design issue.

    If %util doesn’t stay pegged, and you just see small bursts, then you know the disks are NOT the issue and can then focus on more complex diagnosis with networking etc.