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resize2fs

Introduction​

This cheat sheet provides a quick reference for some common resize2fs commands and concepts. resize2fs is a command-line tool used to resize ext2, ext3, and ext4 file systems on Linux.

resize2fs Concepts​

Resizing File Systems​

resize2fs allows you to resize ext2, ext3, and ext4 file systems.

  • Resize a file system to a specific size:

    resize2fs /dev/sdX1 [new_size]

  • Resize a file system to fill the entire partition:

    resize2fs /dev/sdX1

  • Check the file system for errors:

    e2fsck -f /dev/sdX1

  • Resize a mounted file system (requires the file system to be mounted read-only or remounted read-only after e2fsck):

    resize2fs -M /dev/sdX1

Expanding LVM Logical Volumes​

resize2fs is often used in conjunction with LVM (Logical Volume Management) to expand logical volumes and their associated file systems.

  • Expand an LVM logical volume (LV):

    lvextend -l +100%FREE /dev/myvg/mylv

  • Resize the file system on an LVM LV:

    resize2fs /dev/myvg/mylv

Shrinking File Systems​

You can also shrink ext2, ext3, and ext4 file systems with resize2fs, but this is a more complex operation and requires careful planning.

  • Shrink a file system to a specific size:

    resize2fs /dev/sdX1 [new_size]

  • Shrink an LVM logical volume (LV) and file system:

    resize2fs /dev/myvg/mylv [new_size]
    lvreduce -L [new_size] /dev/myvg/mylv

resize2fs Command-Line​

  • Resize a file system to a specific size:

    resize2fs /dev/sdX1 [new_size]

  • Resize a file system to fill the entire partition:

    resize2fs /dev/sdX1

  • Check the file system for errors:

    e2fsck -f /dev/sdX1

  • Resize a mounted file system (requires the file system to be mounted read-only or remounted read-only after e2fsck):

    resize2fs -M /dev/sdX1

Conclusion​

This cheat sheet covers some common resize2fs commands and concepts. resize2fs is a valuable tool for resizing ext2, ext3, and ext4 file systems on Linux, making it essential for system administrators and storage management tasks; refer to the official resize2fs manual for more in-depth information and advanced usage.