The error message "smartctl open device /dev/sda failed: DELL or MegaRaid controller, please try adding '-d megaraid,N'"
If you have more than one RAID controller (e.g., /dev/sda and /dev/sdb from different PERC cards), specify the correct device:
Check health of physical disk #2 behind controller:
Why this happens:
/dev/sda is a logical RAID volume, not a physical disk. The OS sees the virtual disk, but SMART data resides on individual physical drives behind the RAID controller. You need to explicitly tell smartctl to address the physical drive via the MegaRAID interface.
By following these steps and adding the -d megaraid,N option to the smartctl command, you should be able to successfully monitor and manage your disk drives behind a Dell or MegaRAID controller.
), while the physical disks are hidden behind the controller. To access a physical drive's SMART data, you must tell which specific physical disk index ( ) to query. Thomas-Krenn.AG How to Resolve the Error To successfully query your drives, follow these steps: Identify the Physical Disk Index ( You need the (DID) of the physical disk. Use one of the following tools:
Here's an example:
The error message "smartctl open device /dev/sda failed: DELL or MegaRaid controller, please try adding '-d megaraid,N'"
If you have more than one RAID controller (e.g., /dev/sda and /dev/sdb from different PERC cards), specify the correct device:
Check health of physical disk #2 behind controller:
Why this happens:
/dev/sda is a logical RAID volume, not a physical disk. The OS sees the virtual disk, but SMART data resides on individual physical drives behind the RAID controller. You need to explicitly tell smartctl to address the physical drive via the MegaRAID interface.
By following these steps and adding the -d megaraid,N option to the smartctl command, you should be able to successfully monitor and manage your disk drives behind a Dell or MegaRAID controller.
), while the physical disks are hidden behind the controller. To access a physical drive's SMART data, you must tell which specific physical disk index ( ) to query. Thomas-Krenn.AG How to Resolve the Error To successfully query your drives, follow these steps: Identify the Physical Disk Index ( You need the (DID) of the physical disk. Use one of the following tools:
Here's an example: