I recently had a disk go bad so I replaced it.  Took about 18 hours to rebuild from parity.  During that rebuild, two disks showed read errors.  I do not remember the disk numbers.  I subsequently upgraded the OS and then rebooted and started a parity check.  Now I am wondering if I shouldn't have went into each disk, ran a BTRFS scrub first and then ran a parity check?  Just want to make sure I am doing things in the right order.  Diags attached.

unraid-diagnostics-20210712-1728.zip

PS - I *think* one of those disks that I saw read errors on was Disk17.

You should have saved the diags before rebooting, you can run a scrub on the rebuilt disk to look for corruption and run an extended SMART test in all disks, or at least any disk where this is non 0 (like disk17):

 

Elements in grown defect list: 8189

 

 

Thanks.  I will scrub all the disks and replace each as needed.