The error message suggests that the disk drive is behind a RAID controller, which is a hardware component that manages multiple disk drives as a single logical unit. In this case, the controller is a Dell or MegaRAID device. The smartctl utility needs to communicate with the disk drive through this controller, but it doesn't know how to do so by default.
smartctl open device /dev/sda failed: Dell or MegaRAID controller. Please try adding '-d megaraid,N' The error message suggests that the disk drive
smartctl -d megaraid,0 /dev/sda In this example, 0 is the logical drive number (N) associated with the disk drive /dev/sda . You may need to adjust this value depending on your specific configuration. smartctl open device /dev/sda failed: Dell or MegaRAID
Here's an example:
To find the logical drive number, you can use the megacli command, which is a utility provided by LSI (now part of Broadcom) for managing MegaRAID controllers. Here's an example: To find the logical drive