1 Nickel

Re: What might cause multiple failures of drives in the same slot?

Yeah, SCSI errors with no media errors would point away from a drive failure, but since the SCSI errors are reported from both SPA and B sides like you mentioned, it wouldn't be clear which LCC / cable has a potential problem. Although SP Collects (and Ktlogs found on the SP's directory along with the SP Collects) should point out any LC card problems which would need reseating / replacing.

The SR owner would be able to confirm, but if you face any issues there, you can always let me know the SR number and I'll be able to get access to the SP Collects and talk to the owner / yourself.

Good luck, hope the problem is resolved.