Where <N> is the (not the SCSI ID). N ranges from 0 to N-1 , where N = number of physical drives behind the controller.
For virtualization layers and performance stacks, manual configs must bridge outward to wider dashboards. Proxmox VE, TrueNAS, and XCP-ng Nodes
If the operational environment maps the controller cleanly, the utility will return a list matching this format: Where <N> is the (not the SCSI ID)
The error message gives you the exact clue needed. You need to use the -d megaraid device type followed by the specific ID ( N ) of the drive in the array. 1. Identify the Target Device and ID
: Run sudo smartctl --scan to see a list of detected devices and their corresponding IDs. Proxmox VE, TrueNAS, and XCP-ng Nodes If the
: Run smartctl --scan to see if the utility can auto-detect the available physical drive numbers.
smartctl -a -d megaraid,N /dev/sda
The complete solution requires bypassing the abstraction layer of the hardware controller using specific device arguments ( -d ) to target the physical disk IDs ( N ). Why the Error Occurs: The RAID Isolation Layer
: Instructs smartctl to wrap the commands in a MegaRAID frame and target physical slot N . Identify the Target Device and ID : Run
What (Ubuntu, RHEL, Proxmox, etc.) is the server running?
=== START OF READ SMART DATA SECTION === SMART Health Status: OK