Growing ext4 after extending an LV | LinuC Level 1 101 Exam original practice question

1.05.3Basic

The LV /dev/vgdata/lvdocs is already larger, but ext4 still has its old size.

Grow the filesystem to use the current LV size.

Which command is appropriate?

Hint 1: Focus on the requirement

The lower LV is already larger; choose the ext-family tool that grows the filesystem layer.

Hint 2: Key terms

Review the short filesystem and storage definitions before comparing the choices.

resize2fs: Resizes ext2, ext3, and ext4 filesystems.
LV growth: Increasing the block capacity allocated by LVM.
Online growth: Expanding a mounted filesystem while it remains available.
Filesystem layer: The layer that manages files and metadata on a block device.

Detailed explanation

Incorrectlvextend /dev/vgdata/lvdocs

Incorrect. The LV is already extended and this command would not grow ext4.

Incorrectxfs_growfs /dev/vgdata/lvdocs

Incorrect. xfs_growfs is for XFS, not ext4.

Correctresize2fs /dev/vgdata/lvdocs

Correct. resize2fs grows ext4 to the LV's current size.

Incorrectmkfs.ext4 /dev/vgdata/lvdocs

Incorrect. mkfs.ext4 recreates the filesystem and destroys existing files.

An example you can run in a temporary verification environment.

resize2fs -h 2>&1 | sed -n '1,12p'

ext2/ext3/ext4 filesystem resizerの使用法

Environment: e2fsprogs resize2fs / ヘルプ表示のみ
Prefer help or version output and a disposable device when testing storage commands.
Formatting, repair, and mount changes can affect data or availability.

Foundation review

Growing an LV and growing its filesystem are separate operations.

Confirm the lower device size and filesystem support before growing.

Question IDKL-101-596

Environmente2fsprogs resize2fs / ヘルプ表示のみ

Last technical review2026-08-13

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