Smartctl Open Device Dev Sda Failed Dell Or Megaraid Controller Please Try Adding 39d Megaraid N 39 Extra Quality [work] «Exclusive • 2025»

If you run a default health check and receive the following block error: smartctl open device: /dev/sda failed: DELL or MegaRaid controller, please try adding '-d megaraid,N'

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

: Run sudo smartctl --scan to see a list of detected devices and their corresponding IDs. If you run a default health check and

This error typically happens when smartctl tries to query an individual hard drive or SSD directly, but the storage hardware is hidden behind a or an LSI MegaRAID hardware RAID controller. Because the operating system only sees the combined logical volume (like /dev/sda ), the storage manager fails to communicate with the specific physical disks underneath without explicit framing.

Here’s a concise review of the problem and solution: Here’s a concise review of the problem and

sudo smartctl -c -d megaraid,N /dev/sda

To successfully monitor drive longevity, temperature, and media wearout counters, you must route your queries through the specialized controller interface using the -d (device type) flag. smartctl megaraid,N ( how to find the right value for N ? ) This is common with entry‑level RAID cards or

The RAID controller does not expose the physical disks through the standard SCSI layer. This is common with entry‑level RAID cards or those operating in a “simple” RAID mode.

sudo smartctl -l selftest -d megaraid,N /dev/sda

For example, if the enclosure device ID is 39 , the command would be: