As the error message implies, you must use the -d (device type) flag followed by the controller type and the physical disk's slot ID (represented as N ). The standard syntax is: smartctl -a -d megaraid,N /dev/sda Use code with caution. : Displays all S.M.A.R.T. information.
To bypass this and query the physical disks directly, you must use the -d megaraid,N option. This flag uses the MegaRAID , a specific interface in the Linux kernel that allows tools like smartctl to send commands directly to the physical drives behind the RAID controller.
smartctl -d megaraid,0 /dev/sda
When running smartctl on a Dell PowerEdge server or any system using a MegaRAID (LSI/Broadcom) controller, you often encounter this error: Smartctl open device: /dev/sda failed: Dell or MegaRAID controller, please try adding '-d megaraid,N' .
Drive Information : ================= ------------------------------------------------------- EID:Slt DID State DG Size Intf Med SED PI SeSz Model ------------------------------------------------------- 252:0 4 Onln 0 1.818 TB SAS HDD N N 512B ST2000NM0001 252:1 5 Onln 0 1.818 TB SAS HDD N N 512B ST2000NM0001 ------------------------------------------------------- Use code with caution. As the error message implies, you must use
When the operating system reads /dev/sda , it is interacting with an emulated, unified virtual drive, not a physical piece of silicone or spinning media.
Here, N represents the disk number within the MegaRAID controller. information
The solution involves adding the -d megaraid,N option to the smartctl command. Here's how:
Modern Dell servers (12th generation and newer) use perccli (PowerEdge RAID Controller CLI) as the successor to MegaCLI and MegaRAID Storage Manager . smartctl -d megaraid,0 /dev/sda When running smartctl on
You cannot guess this number, as it doesn't always start at 0. Use the storcli (or older MegaCli ) utility to find the (Device ID). Command : sudo storcli /c0 /eall /sall show