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

Look for the DID (Device ID) or PD ID column – those numbers are your N values.

This happens because the operating system sees a (the RAID array), but smartctl needs to talk directly to the physical disks hidden behind the controller. The Solution: Using the -d megaraid,N Flag

smartctl open device /dev/sda failed: Dell or MegaRAID controller. Please try adding '-d megaraid,N'

smartctl -d megaraid,1 -H /dev/sdb

If you are using SATA drives behind a MegaRAID controller, you might need to combine flags: smartctl -a -d sat+megaraid,4 /dev/sda Use code with caution. Copied to clipboard 3. Summary of Key Flags smartctl megaraid,N ( how to find the right value for N ? )

If your drives are SATA (rather than SAS) behind a MegaRAID controller, you may need a combined device type: sudo smartctl -a -d sat+megaraid,N /dev/sda Use code with caution. Copied to clipboard Troubleshooting Tips Permissions : Always run these commands with or as root. Outdated Software megaraid,N still fails, ensure you are using a recent version of smartmontools Drive Handle

This will output pairs showing the Enclosure Device ID and Slot Number for every active physical drive. Automating smartd for MegaRAID Monitoring Look for the DID (Device ID) or PD

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 --scan -d megaraid

Dell’s PERC cards (especially Series 7, 8, 9, 10, and 11) are rebranded LSI MegaRAID controllers. Therefore, the generic -d megaraid,N flag is the correct interface. Please try adding '-d megaraid,N' smartctl -d megaraid,1

For environments monitoring array metrics through an InfluxDB stack, configure your telegraf.conf file by breaking out instances per drive slot index:

Guessing the slot ID number can be tedious, especially on servers with dozens of drive bays. You can find the exact slot IDs using command-line storage utilities. Method 1: Using storcli (Recommended)

The smartctl open device failed error is a standard and expected response when querying a hardware RAID controller. It is not an error with the drives, but a notification that you are not using the proper syntax to access the physical devices behind the controller. ) If your drives are SATA (rather than