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Parity check extremely slow + 1 drive showing errors

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Hi,

Woke up to a notification that one of my drives (sdb) is showing errors, currently 9600. When I checked I also notice that the parity check was often dropping to less than 2.5 MB/s for long stretches of time (~15 mins) before returning to normal speed for a few minutes and the cycle repeating.

SMART report for the drive seems fine to my untrained eyes but this is the first time I've had errors showingon a drive.

Just curious if I should let parity run it's course, despite an estimated finish of over 2 months, or if I should stop the check and replace the drive ASAP.

Diagnostics attached.

Thanks

thepitt-diagnostics-20250601-0818.zip

Solved by JorgeB

  • Author

After swapping the cables I am still seeing the same issue.

Additionally I ran a DiskSpeed test before an after the swap and the results are similar (attached). There is a catastrophic drop in speed around the 750GB mark on both the old and new cable.

I assume based on these results I should be replacing the drive ASAP?

I probably should not resume the scheduled parity check until after the swap as well?

Screenshot 2025-06-01 092124.png

  • Solution
19 hours ago, Magma said:

I assume based on these results I should be replacing the drive ASAP?

Yep

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