Smartctl Open Device Dev Sda Failed Dell Or Megaraid Controller Please Try Adding 39--d Megaraid N 39- !exclusive! -

Smartctl open device: /dev/sda failed: DELL or MegaRaid controller, please try adding '-d megaraid,N'

Dell PowerEdge servers use cards (e.g., PERC H310, H330, H730p, H740p). Almost all PERC controllers from the 10th generation onward are based on LSI MegaRAID chipsets.

From the operating system's perspective, it sees a single block device (e.g., /dev/sda ). It has no idea that /dev/sda is actually a RAID 5 array consisting of four physical spinning disks. The OS speaks to the controller, and the controller manages the physical drives. Smartctl open device: /dev/sda failed: DELL or MegaRaid

If you are using U.2 NVMe drives on a PERC H745 (Tri-Mode), the megaraid flag may not work. You must use:

In a standard consumer desktop or a server with a simple "JBOD" (Just a Bunch of Disks) configuration, the operating system talks directly to the hard drive via a SATA or SAS controller. In this scenario, /dev/sda points directly to the physical disk. smartctl can query the disk directly without any translation layer. It has no idea that /dev/sda is actually

You cannot guess N . Use one of these utilities to find the physical IDs of your disks:

smartctl -a -d megaraid,N /dev/sda

The solution is to change your syntax from: