Always prefix your commands with sudo or run them as the root user. Additionally, ensure your user is a member of the disk group on some distributions.
If you want the S.M.A.R.T. daemon ( smartd ) to continuously monitor your drives behind a MegaRAID controller and alert you of failures, you must modify its configuration file.
In this case, the device IDs are 7 , 6 , 5 , and 4 . To query the first physical disk, you would run:
Detection & classification
This error does mean your hard drive is failing. It means smartctl cannot talk directly to the physical disk because the operating system only sees the virtual RAID volume ( /dev/sda , /dev/sdb , etc.), not the individual physical drives.
Run this storcli script to display all physical drives and enclosure indices: sudo storcli /c0 /eall /sall show Use code with caution.
The error message gives you the exact clue needed. You need to use the -d megaraid device type followed by the specific ID ( N ) of the drive in the array. 1. Identify the Target Device and ID Always prefix your commands with sudo or run
List all physical disks in the RAID volume:
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.
RAID volumes (virtual disks) will appear with the vendor name LSI or DELL and Type: Direct-Access . Physical disks attached to the controller may also be listed, with their channel and ID information. daemon ( smartd ) to continuously monitor your
Step 2: Extracting Missing Physical IDs via MegaCli / StorCli
This error occurs because the operating system sees your RAID controller (e.g., a LSI MegaRAID
