Hey folks. I have mostly inherited supporting a couple hundred 1U bare metal linux servers. Many of them are aging.

I need to replace about 10 hard disks that have been faulted by mdadm from RAID1's in the field working with random data center techs. Except, I don't know how to reliably identify the physical location on the server for the failed disks.

I replaced 4 of these last year, and on the server chassis, the faulty disk LED's were indistinguishable from the good disks. For these, I ran dd if=sdb of=/dev/null on the good drive, and the tech figured out the faulty disk was the one not blinking a lot. Except, two times, this didn't work, and they removed the remaining good disk.

These are HP and Dell servers. Any ideas?