Re: kworker consumes 100% CPU on degraded RAID6

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On Fri, Oct 27, 2023 at 5:59 PM Eyal Lebedinsky <fedora@xxxxxxxxxxxxxx> wrote:
>
> Fully updated F28.
>
> I had to send one (of 7) member disk for RMA.
> I notice that the system is very non responsive. 'top' shows
>
>      PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
> 1365697 root      20   0       0      0      0 R  93.8   0.0 384:40.55 kworker/u16:3+flush-9:127
>
> This continues even when there are no user actions (ff, tb closed).
>
> A few days ago it stopped, but today I see that it kept running all night where there were
> period of inactivity for a few hours.
>
> As another point: a few days ago I received a disk from RMA and the recovery went as fast as expected.
> I then removed another disk to send for RMA.
>
> Is this expected? Is there anything I can do to improve the situation?

If you have a hot spare and a lot of data, I could envision a
situation where a low priority thread takes several days to rebuild
the array. Or that has been my [limited] experience when failing over.
But it usually happens in the background, and does not affect
responsiveness too much.

Jeff
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