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

Accessing S.M.A.R.T. data requires root privileges:

sudo smartctl -a -d megaraid,0 /dev/sda

The error is not a bug – it's a deliberate safety mechanism. The RAID controller hides physical disks by design. Using -d megaraid,N is the correct, supported, and safe method to query SMART data on Dell PERC and LSI MegaRAID controllers. Ignoring this flag risks querying the wrong device or corrupting the RAID metadata.

Always use:

smartctl -a -d megaraid,<physical_disk_id> /dev/sda

Many modern servers use hardware RAID controllers (e.g., Dell PERC / LSI MegaRAID) that present physical drives behind the controller, preventing smartctl from accessing raw device paths like /dev/sda. This feature outlines a robust implementation to detect such controllers, attempt appropriate access methods, and provide actionable fallback steps — including adding support for MegaRAID controllers (e.g., using the megaraid plugin/option) — to surface SMART data where possible. Accessing S

The error message explicitly tells you what to do. You must:

When attempting to check the health of a hard drive behind a Dell PERC (PowerEdge RAID Controller) or MegaRAID controller using smartctl, you may encounter the following error:

smartctl: open device: /dev/sda failed: Dell or MegaRAID controller

This error occurs because the operating system does not have direct access to the physical hard drive. The RAID controller acts as an intermediary, presenting logical volumes (like /dev/sda) to the OS while hiding the physical disks. To access the SMART data of the physical disks, you must communicate through the RAID controller driver. The error is not a bug – it's

smartctl -i -d megaraid,0 /dev/sda

(Just shows identity, no destructive action.)

Here is a simple Bash script to iterate through all possible physical disks on /dev/sda (adjust if needed):

#!/bin/bash
LOGICAL_DEV="/dev/sda"
MAX_DISKS=32  # Adjust based on max expected drives
for N in $(seq 0 $((MAX_DISKS-1))); do
echo "Checking $LOGICAL_DEV -d megaraid,$N"
smartctl -H -d megaraid,$N $LOGICAL_DEV > /dev/null 2>&1
if [ $? -eq 0 ]; then
echo "Disk $N exists. Health status:"
smartctl -H -d megaraid,$N $LOGICAL_DEV | grep "SMART overall-health"
echo "---"
else
# No more disks found
break
fi
done
 Many modern servers use hardware RAID controllers (e

A more robust script would parse storcli output to get exact PD list.

For production servers, manually checking smartctl on each physical disk is tedious. Consider: