Trying to find a failed drive that does not have a red light on it can be quite challenging with the Open Vault Knox Unit(s) since the drives/slots are not labeled.

After looking around the interweb’s and reading the Open Compute Project Open Vault Storage Specification I found the diagram indicating which drive is which.

That being said, you should be able to use MegaCLI to identify the drives using the following command:

./MegaCli -PdLocate -start -physdrv[64:0] -a0

Using MegaCLI, you can also list those drives, and their status using:

./MegaCli pdlist -a0 | grep 'Firmware state'

And you can see the results here, after the drive was replaced.

[root@hadoopnode0 ~]# megacli pdlist -a0 | grep 'Firmware state'
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up
Firmware state: Online, Spun Up

Tags: Knox Unit, OCP, Open Compute, Open Vault