Disk & Filesystem Management (Du/Df/Lsblk/Fstrim)
Stop wondering where your cloud block storage went
🧩 The Challenge
You finally bump up that AWS EBS volume or a thin-provisioned LUN, but the filesystem still thinks the old size is the limit. It’s infuriating to pay for extra capacity that your kernel refuses to acknowledge.
đź’ˇ The Fix
Trigger a filesystem resize operation while the volume is mounted to bridge that gap. You won’t even need to take your service down for a reboot to get that extra space online.
resize2fs /dev/mapper/vg00-lv_root⚙️ Why It Works
Expanding the physical block device is only half the battle; this command tells the filesystem driver to stretch its data structures to fill the newly available blocks on the partition.
🚀 Pro-Tip: Run lsblk first to confirm the device actually shows the new size before you try to resize the filesystem, otherwise you’re just yelling at the wind.
Linux Tips & Tricks | © ngelinux.com | 8/31/2026