Smartctl Open Device Dev Sda Failed Dell Or Megaraid Controller Please Try Adding 39--d Megaraid N 39- Jun 2026

You cannot guess N . Use one of these utilities to find the physical IDs of your disks:

lsmod | grep megaraid

From the operating system's perspective, it sees a single block device (e.g., /dev/sda ). It has no idea that /dev/sda is actually a RAID 5 array consisting of four physical spinning disks. The OS speaks to the controller, and the controller manages the physical drives. You cannot guess N

cannot directly query a physical drive when it is behind a hardware RAID controller like a LSI MegaRAID N /dev/sda Here

Look for the DID (Device ID) column. Output example: 1 and megaraid

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

Here, DID 1 and DID 5 correspond to megaraid,1 and megaraid,5 .