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

It sounds like you’re encountering the classic smartctl error when trying to access a physical disk behind a Dell PERC (MegaRAID) controller. The message you're referencing is essentially telling you to use the correct device syntax: -d megaraid,N.

Solution:

This command will list all physical disks attached to the MegaRAID controller. Look for the disk you want to monitor and note its PD (Physical Disk) number. It sounds like you’re encountering the classic smartctl

Method 3: Use lsblk + inference – less reliable, but if you have 4 drives in RAID10, IDs 0 and 1 are likely the first mirror pair.

The "39" in the text is likely a remnant of a specific example (e.g., using drive 39), but the correct syntax requires you to identify your specific drive number. Look for the disk you want to monitor

Fix: smartctl "Open Device Failed" on Dell or MegaRAID Controllers

Finding the Logical Drive Number

To test all drives automatically:

By ignoring the garbled "39" text and identifying the correct disk index, you will successfully bypass the "Device Open Failed" error and retrieve your SMART data. Fix: smartctl "Open Device Failed" on Dell or