To find the logical drive number, you can use the megacli command, which is a utility provided by LSI (now part of Broadcom) for managing MegaRAID controllers.
megacli -ldinfo -lall This command will display information about all logical drives configured on the MegaRAID controller. Look for the logical drive number associated with the disk drive you want to monitor. To find the logical drive number, you can
smartctl open device /dev/sda failed: Dell or MegaRAID controller. Please try adding '-d megaraid,N' To find the logical drive number
To resolve this issue, you need to inform smartctl about the presence of the MegaRAID controller and the logical drive number (N) associated with the disk drive you want to monitor. You can do this by adding the -d megaraid,N option to the smartctl command. you can use the megacli command