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

One of the most common reasons the error persists after adding -d megaraid,N is using an incorrect device ID. Here are three reliable ways to identify the correct device ID for each physical disk.

This happens because the controller intercepts all communication to protect the RAID array's integrity. For hardware RAID environments like Dell PowerEdge servers with PERC controllers or other LSI-based MegaRAID cards, smartctl requires a special -d megaraid,N syntax. The N value is a non-negative integer (usually 0 to 127) that identifies the specific physical disk to query.

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

To set up automatic monitoring, you must configure /etc/smartd.conf with the correct -d megaraid,N directives. Here is what an entry for a physical disk with ID 0 might look like:

The error smartctl open device: /dev/sda failed: DELL or MegaRAID controller, please try adding -d megaraid,N is not a bug—it is a sign that you need to tell smartctl which physical drive behind the RAID controller to query. One of the most common reasons the error

(Note: You can usually use /dev/sda or /dev/bus/0 as the device path when using the -d megaraid,N flag, as the flag overrides the path to target the specific disk via the controller.)

A more robust script would parse storcli output to get exact PD list. For hardware RAID environments like Dell PowerEdge servers

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The smartctl open device failed: DELL or MegaRaid controller error is a normal, expected behavior when a hardware RAID controller is present. It is not a malfunction—it is the tool’s way of saying, “I cannot see individual disks directly. Please tell me which physical drive you want to check by using the -d megaraid,N parameter.” Here is what an entry for a physical

Once you successfully retrieve S.M.A.R.T. data, it is crucial to understand what the numbers mean. Simply seeing a PASSED status at the top of the output is not sufficient—a disk can pass the overall health check while still having underlying problems.

In this case, the device IDs are 7 , 6 , 5 , and 4 . To query the first physical disk, you would run: