cannot "see through" the controller by default, it fails to open The Fix: Using the -d megaraid,N To access a specific physical drive, you must tell which "slot" or it occupies on the controller. Identify the Device ID ( Use a RAID management tool like
(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.) cannot "see through" the controller by default, it
In your error log, you may see a suggestion resembling: "please try adding 39d megaraid n 39 extra quality." occurs because hardware RAID controllers (like Dell PERC
Fix: smartctl "Open Device /dev/sda Failed" on Dell MegaRAID Controllers Identify the Correct Device ID ( " in
If the controller is set to JBOD (individual disks passthrough without RAID), you might not need -d megaraid,N . But Dell PERC defaults to RAID mode; JBOD is rare.
occurs because hardware RAID controllers (like Dell PERC or LSI MegaRAID) hide individual physical drives from the operating system, presenting only a "virtual" drive instead. To view the SMART health of a specific physical disk, you must bypass the RAID abstraction using a specialized "cheat code" syntax. Unix & Linux Stack Exchange 1. Identify the Correct Device ID ( " in the command represents the Physical Drive ID