Parity-Sync dropped from 100MB/s to 1MB/s after going through 7.96TB with 2.04TB left to go please help

[mdpmcc]

As title suggests parity sync has dropped down to really slow this is after removing my 8TB parity disk and installing a new 10TB replacement old disk wasnt bad just wanted to upgrade it  attaching a diagnostics 

tower-diagnostics-20221005-2154.zip

[JorgeB]

It it still going slow or did it speed up after the 8TB mark? Possibly you have a disk with slow sectors, diskspeed docker might show something.

[mdpmcc]

Seems to have accelerated and finished overnight 

[JorgeB]

Most likely one of the 8Tb disks developing some slow zones.