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Created January 4, 2026 17:21
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hot disk resize.md

Resizing a Linux Disk After VM Expansion

1. Rescan the disk to detect new size

echo 1 > /sys/class/block/sda/device/rescan

Verify with lsblk — disk should now show the new size.

2. Extend the partition

growpart /dev/sda 1

3. Resize the filesystem

For ext4:

resize2fs /dev/sda1

For xfs:

xfs_growfs /

Notes

  • All commands require root
  • Works online (no reboot needed)
  • growpart is in the cloud-guest-utils package (Debian/Ubuntu) or cloud-utils-growpart (RHEL/CentOS)
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