If you encounter the error Smartctl open device: /dev/sda failed: DELL or MegaRaid controller, please try adding '-d megaraid,N' , it means smartctl cannot directly talk to your hard drives because they are hidden behind a (like a Dell PERC). To fix this, you must tell smartctl exactly which physical drive to look at using the -d megaraid,N flag. Why This Error Occurs

doesn't work, use one of these methods to find the actual physical drive IDs: sudo smartctl --scan

Assuming you want to monitor a disk with a PD number of 2, the smartctl command would be:

One will fail (non-existent drive) or return info for the correct disk.

: Run sudo megacli -PDList -aALL | grep "Device Id" . Step 2: Run the Correct Command

Alternatively, use the Dell/LSI tool with the command sudo storcli /c0 /eall /sall show and look for the DID (Device ID) column. Execute the Correct Command :

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

If you encounter the error Smartctl open device: /dev/sda failed: DELL or MegaRaid controller, please try adding '-d megaraid,N' , it means smartctl cannot directly talk to your hard drives because they are hidden behind a (like a Dell PERC). To fix this, you must tell smartctl exactly which physical drive to look at using the -d megaraid,N flag. Why This Error Occurs

doesn't work, use one of these methods to find the actual physical drive IDs: sudo smartctl --scan If you encounter the error Smartctl open device:

Assuming you want to monitor a disk with a PD number of 2, the smartctl command would be: : Run sudo megacli -PDList -aALL | grep "Device Id"

One will fail (non-existent drive) or return info for the correct disk. please try adding '-d megaraid

: Run sudo megacli -PDList -aALL | grep "Device Id" . Step 2: Run the Correct Command

Alternatively, use the Dell/LSI tool with the command sudo storcli /c0 /eall /sall show and look for the DID (Device ID) column. Execute the Correct Command :