Smartctl Open Device Dev Sda Failed Dell Or Megaraid Controller Please Try Adding 39d Megaraid N 39 Extra Quality May 2026

Subject: Fixing smartctl "open device dev/sda failed" on Dell/MegaRAID

Content:
To fix the error smartctl open device /dev/sda failed, you must specify the RAID controller interface and logical drive number.

Use this syntax:

smartctl -a -d megaraid,<Enclosure_Device> /dev/sdX

Example for a Dell PERC controller:

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

💡 Pro tip: Use -d megaraid,N where N is the physical disk index behind the controller (0,1,2...). Run smartctl --scan to find available devices.

For MegaRAID/Dell PERC, the most reliable tool is storcli (successor to megacli):

storcli /c0 /eall /sall show

That lists all physical disks in controller 0. Look for DID (Device ID) or ID – that is your N. Subject: Fixing smartctl "open device dev/sda failed" on

Example output snippet:

PD LIST :
=======
EID:Slt DID State DG     Size Intf Med
16:0     0   Onln   0 1.818 TB SATA HDD
16:1     1   Onln   0 1.818 TB SATA HDD

Here, DID column gives 0 and 1 as physical drive numbers.

Here’s a bash one-liner to check all physical disks on the first controller: Example for a Dell PERC controller: smartctl -a

for pd in 0..15; do smartctl -H -d megaraid,$pd /dev/sda &>/dev/null; if [ $? -eq 0 ]; then echo "PD $pd OK"; else echo "PD $pd missing or error"; fi; done

Before using smartctl, you need to map logical drives to physical disk IDs.

/dev/sda -d megaraid,0 -d megaraid,1 -d megaraid,2 -d megaraid,3 -a -o on -S on -s (S/../.././02|L/../../7/03) -m admin@example.com

But smartd doesn't usually accept multiple -d per line. Better to add separate lines:

/dev/sda -d megaraid,0 -a -o on -S on -m admin@example.com
/dev/sda -d megaraid,1 -a -o on -S on -m admin@example.com
...

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

Shows SMART data for physical disk 0 behind /dev/sda. 💡 Pro tip: Use -d megaraid,N where N