Anecdote, but I had once a broken SATA controller that would send borked data to the disks. That was tricky because the disks were correctly writing the data se

Anecdote, but I had once a broken SATA controller that would send borked data to the disks. That was tricky because the disks were correctly writing the data sent to them and from the OS side all the operations were completed successfully. I realized that only because there was a continuous stream of checksum errors on all the disks of the pool.