Disk & Filesystem Management (Du/Df/Lsblk/Fstrim)

Stop worrying about the actual health of your hardware

🧩 The Challenge

You look at lsblk and see a disk, but you have no idea if that drive is secretly dying behind the scenes. I once spent three days chasing random data corruption only to realize the disk controller was reporting errors the OS just wasn’t shouting about.

💡 The Fix

Use smartctl to pull the raw health data directly from the drive firmware. It saves you from guessing if that weird IO hang is a cable issue or a drive heading for the silicon graveyard.

smartctl -a /dev/sda | grep -E 'SMART overall|Reallocated_Sector_Ct|Current_Pending_Sector'

⚙️ Why It Works

By grabbing these specific attributes, you’re looking at the drive’s internal counters for bad sectors that have already been swapped out or are waiting for a write attempt to finalize their failure.

🚀 Pro-Tip: Alias this to something like ‘check-disk’ so you actually run it before pulling your hair out during a production outage.

Linux Tips & Tricks | © ngelinux.com | 9/27/2026