Extremely slow parity check

[AlbertoGa]

I added a drive to my array, copied some stuff, added a second drive and started a parity check. I usually have an estimated speed of 100MB/s +. Now it's in the hundreds of KB/s and the full check is estimated to take about a year. How do I fix this?

 

Edited July 7 by AlbertoGa
Added diiagnostics

[JorgeB]

Please post the diagnostics.

[AlbertoGa]

9 minutes ago, JorgeB said:

Please post the diagnostics.

Done, added to post

[JorgeB]

Constant ATA errors for parity, replace cables and post new diags after a new parity check start.

[AlbertoGa]

On 7/2/2024 at 2:43 PM, JorgeB said:

Constant ATA errors for parity, replace cables and post new diags after a new parity check start.

Changed cables for brand new ones I had on hand. Same problem.

Edited July 7 by AlbertoGa

[JorgeB]

Errors continue, if you replaced both cables it could be a bad disk, you can swap cables with a different disk to make sure, see where the problem follows.

[AlbertoGa]

I'll do that, so far I've replaced all cables with new ones, I'll swap them. I also ran SMART short self-test on all drives. All were completed without error.

[AlbertoGa]

4 hours ago, JorgeB said:

Errors continue, if you replaced both cables it could be a bad disk, you can swap cables with a different disk to make sure, see where the problem follows.

I swapped a bunch of cables, both sata and power and eventually it worked. Thank you and my apologies for asking for help with something so trivial. For the future so I can troubleshoot this issue myself, where did you see the errors?

[JorgeB]

In the syslog.