Sda Failed Dell Or Megaraid Controller Please Try Adding 39d Megaraid N 39 Extra Quality: Smartctl Open Device Dev

The root cause is that standard ATA/SCSI commands sent to a raw disk device cannot pass through the RAID controller. The controller must be told exactly which physical disk you want to query by its using the -d megaraid,N option.

Enterprise environments using hypervisors like Proxmox VE or XCP-ng often generate automated email alerts stating a drive inquiry failed. This occurs because hypervisor GUI graphs attempt standard disk scans natively. Always rely on the hardware vendor's plugin utilities or deploy explicit metrics collectors, such as Prometheus Node Exporter or Telegraf agents configured to run individual array queries. Sample Telegraf Integration Hook

Fix: smartctl "Open Device /dev/sda Failed" on Dell MegaRAID Controllers The root cause is that standard ATA/SCSI commands

(device type) flag to specify the controller type and the physical drive index ( Command Syntax: sudo smartctl -a -d megaraid,N /dev/sda Use code with caution. Copied to clipboard : Displays all SMART information. -d megaraid,N : Points to the cap N raised to the t h power physical drive (starting at 0). : The logical device handle for the RAID controller. Step-by-Step Guide 1. Find the Physical Drive Index (

Here is a simple Bash script to iterate through all possible physical disks on /dev/sda (adjust if needed): This occurs because hypervisor GUI graphs attempt standard

In this command:

For many systems with a single RAID volume, the command that works is: Copied to clipboard : Displays all SMART information

To view all physical disks and their device IDs:

Sometimes helpful for direct-attached drives, but less so behind RAID. Try:

If you have multiple arrays, the N value might not correspond linearly to the physical slot. The smartctl scan command is the best way to verify, or check megacli -PDList -aAll .