If you know disk sizes differ, you can try:
smartctl -d megaraid,0 /dev/sda
# Short test (usually completes within 2 minutes) sudo smartctl -t short -d megaraid,N /dev/sda
The value for N (the Device ID) is not always 0, 1, 2, etc. You can find the correct IDs using two methods: smartctl --scan Use code with caution. Copied to clipboard If you know disk sizes differ, you can
To query the individual physical drives hidden behind your RAID array, you must explicitly instruct smartctl to pass its commands through the MegaRAID controller layer using specialized syntax. Why Standard S.M.A.R.T. Queries Fail on RAID
Open the file /etc/smartd.conf using a terminal text editor: sudo nano /etc/smartd.conf Use code with caution.
Do you know the exact or MegaRAID controller model ? Are you using SATA or SAS drives? Share public link Why Standard S
What (Ubuntu, RHEL, Proxmox, etc.) is the server running?
The storcli utility (formerly MegaCLI ) is the official command-line tool for managing LSI/Avago MegaRAID and Dell PERC controllers. It provides the most detailed and accurate device information.
If you manage servers with hardware RAID controllers—especially Dell PowerEdge servers with PERC (PowerEdge RAID Controller) or any system using a Broadcom (formerly LSI) MegaRAID controller—you have likely encountered a frustrating error when trying to check disk health with smartctl : Are you using SATA or SAS drives
Here’s a bash one-liner to check all physical disks on the first controller:
/dev/sda -d megaraid,0 -a -m admin@yourdomain.com /dev/sda -d megaraid,1 -a -m admin@yourdomain.com /dev/sda -d megaraid,2 -a -m admin@yourdomain.com Use code with caution. Restart the daemon to apply changes: systemelf restart smartd Use code with caution. Troubleshooting Common Errors