I have 1 disk, an older 4tb WD Black, in my array with read errors. There were 3 of these drives in the array, this one and another had previous read errors shown, the other also had reallocated sectors so I swapped it out.

 

The drive in question has no SMART data that would indicate a failure to me. Most of the drives in this array are in the same Netapp DS4243 disk shelf on the same LSI 9201 16e controller, so it's not cabling.

 

The array is currently in a parity rebuild (but has double parity anyway) as I pulled an old 450GB SAS drive from it to put a 12TB SAS drive in it's place. I do have another 12TB SAS drive precleared and ready to add to the array I could swap the 4TB with, but I'm not sure if I'm being overly cautious. The last time I saw read errors, was also in a parity rebuild.

 

Are these read errors recovered errors or unrecovered errors?

 

Diagnostics attached

 

https://imgur.com/MaXkvye Screenshot of main page.

https://imgur.com/1ScIKew drive to controller mappings. The SSDs on the LSI controller are not in the disk shelf, all the HDDs are.

tacgnol-core-diagnostics-20210316-0710.zip

It's logged as a disk problem, you should run an extended SMART test.

I have done so, but it shows no errors.

 

Then the disk is fine for, just keep monitoring.