• Turbo mode / md_write_method "reconstruct write" ignored whilst "Clearing in progress"

    DeanMarkTaylor

    By DeanMarkTaylor

      • Annoyance

    Write performance is reduced whilst "Clearing in progress".

    Possible optimisation not being used?

     

    Whilst a drive is "clearing" (4) it has the same effect as "Tunable (md_write_method)" being changed from "reconstruct write" to "read/modify/write"...

    ... i.e. I see reads on both parity drives (1) at the same MB/s rate as the reads from the source drive (2) and writes to one array drive (3).

     

    When a drive is not "clearing" the write performance is as expected, and parity drives are not read from.

     

    image.thumb.png.915a82119c095b42b1ee4afef2d7fa98.png

     

    I can imagine a test where if not all drives can be read the "md_write_method" mode changes from "reconstruct write" to "read/modify/write" - but perhaps drives being cleared should be ignored?

     

     

    bigbirdfeet-diagnostics-20211214-2022.zip

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