Smartctl Open Device Dev Sda Failed Dell Or Megaraid Controller Please Try Adding 39d Megaraid N 39 Extra Quality ⏰ 💫

You can try to list all drives behind the controller to identify the correct N value (starting from 0, 1, 2...): smartctl -a -d megaraid,0 /dev/sda Use code with caution.

smartctl -a -d megaraid,4 /dev/sda

Because standard S.M.A.R.T. commands cannot pass straight through the RAID abstraction layer, smartctl fails unless you explicitly tell it how to bypass the controller and target a specific physical drive slot. You can try to list all drives behind

smartctl -d megaraid,2 --all /dev/sda

Following these practices will ensure you can effectively monitor the health of every drive in your RAID array and prevent data loss. the smartctl command would be:

Once you have the device index ( N ), use the following command structure: sudo smartctl -a -d megaraid,N /dev/sda Use code with caution.

When the test completes, view the results with: a RAID controller presents a (e.g.

: Run sudo MegaCli -pdlist -a0 | grep 'Device Id' to list the IDs of all physical drives on the first controller. 2. Run the Correct smartctl Command Once you have the ID (e.g., 8 ), use it in your command: General Syntax : sudo smartctl -a -d megaraid,N /dev/sda

This message appears because smartctl (part of the smartmontools package) expects to communicate directly with a physical disk. However, a RAID controller presents a (e.g., /dev/sda , /dev/sdb ) to the operating system. The OS sees only the logical array, not the individual physical disks behind the controller. To get S.M.A.R.T. data from each physical drive, you must bypass this virtualization using the -d megaraid,N flag.

Assuming you want to monitor a disk with a PD number of 2, the smartctl command would be: