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

The error message "smartctl open device: /dev/sda failed: DELL or MegaRAID controller, please try adding '-d megaraid,N'" occurs because smartctl is trying to talk directly to a virtual RAID volume (e.g., /dev/sda) instead of the physical hard drives hidden behind the controller.

Run a short self-test on physical disk #0: The error message "smartctl open device: /dev/sda failed:

• -d: The flag telling smartctl to specify the device type.
• megaraid: The driver type for Dell PERC/Lsi MegaRAID cards.
• N: A variable representing the physical drive number.

smartctl open device /dev/sda failed: Dell or MegaRAID controller. Please try adding '-d megaraid,N' -d : The flag telling smartctl to specify the device type

SMART Health Status: OK

Method 3: Use lsblk + inference – less reliable, but if you have 4 drives in RAID10, IDs 0 and 1 are likely the first mirror pair. smartctl open device /dev/sda failed: Dell or MegaRAID