This error occurs because the MegaRAID controller abstracts the physical hard drives or SSDs. The operating system does not see individual drives directly; it only sees the logical volume (Virtual Disk) created by the controller, typically mapped as /dev/sda or /dev/sdb .
smartctl -d megaraid,N [other options]
smartctl -A -d megaraid,1 /dev/sda
To set up automatic monitoring, you must configure /etc/smartd.conf with the correct -d megaraid,N directives. Here is what an entry for a physical disk with ID 0 might look like: This error occurs because the MegaRAID controller abstracts
笶� Standard Request: [ smartctl ] ----> [ /dev/sda (Logical Volume) ] ----> [ RAID Controller ] --X--> [ Physical Drives ] Correct Path: [ smartctl -d megaraid,0 ] ----> [ Pass-through Command ] ----> [ Controller Enclosure ] ----> [ Physical Drive 0 ]
sudo smartctl -t long -d megaraid,N /dev/sda
Host: scsi0 Channel: 02 Id: 00 Lun: 00 Vendor: LSI Model: MR9271-4i Rev: 3.27 Type: Direct-Access Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: WDC WD5003ABYX-0 Rev: 01.0 Type: Direct-Access Host: scsi3 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: WDC WD5003ABYX-0 Rev: 01.0 Type: Direct-Access Here is what an entry for a physical
corresponds to the assigned by your RAID controller, which may not simply be 0, 1, 2, etc.. Use one of the following methods to find it:
to see if the utility can automatically detect the correct mapping for you. Run the Correct Smartctl Command Once you have the index (for example, ), use the (device type) flag: For SAS/SCSI Drives smartctl -a -d megaraid,11 /dev/sda For SATA Drives sat+megaraid smartctl -a -d sat+megaraid,11 /dev/sda www.couyon.net Summary Table: Syntax by Drive Type Drive Type Syntax Command smartctl -a -d megaraid,N /dev/sda smartctl -a -d sat+megaraid,N /dev/sda Troubleshooting Tips Error with smartctl on Dell/Megaraid ﾂｷ Issue #660 - GitHub
Manually appending flag variables is helpful for ad-hoc terminal diagnostics, but production monitoring requires daemon persistence. To automate these definitions so monitoring daemons (like smartd ) don't crash or throw error loops, edit the primary smartmontools daemon configuration file: To automate these definitions so monitoring daemons (like
or a Broadcom/LSI MegaRAID adapter窶杯he Operating System does not maintain direct line-of-sight to the physical Hard Disk Drives (HDDs) or Solid State Drives (SSDs). Instead, the RAID controller acts as a protective mediator:
user wants a long article about the error "smartctl open device dev sda failed dell or megaraid controller please try adding 39d megaraid n 39". The search results are currently in Chinese. I need to explore these results, gather more information, and then structure the article. I'll follow the search plan outlined in the instructions. search results for the initial keyword are empty. The search for Dell PERC smartctl examples returned a Dell page with command examples. The search for smartctl -d megaraid,N syntax returned no results. The search for smartctl --scan returned a CSDN page. I need to continue with the next set of searches. have a good set of search results covering various aspects. I will structure the article with an introduction, sections on why the error occurs, how to fix it with the -d megaraid,N option, how to find the correct N, advanced scenarios, automating with smartd, troubleshooting, best practices, and a conclusion. I'll cite relevant sources, like the Dell documentation, StackExchange, CSDN, and wiki pages. Now I'll start writing the article. is an outstanding question that gets to the heart of how smartctl interacts with hardware RAID controllers. The error message is actually a helpful clue, not a dead end. Let's break down exactly why this happens and how to properly query your drives.
The smartctl open device failed error is a standard and expected response when querying a hardware RAID controller. It is not an error with the drives, but a notification that you are not using the proper syntax to access the physical devices behind the controller.