resize2fs

What it does

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resize2fs [OPTION]... DEVICE [SIZE]

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$ run as a normal user# run as root (or with sudo)

1. 1Grow after lvextend

   #lvextend -L +2G /dev/vgdata/lvweb
   #resize2fs /dev/vgdata/lvweb

   Online grow of a mounted ext4.

2. 2Shrink to 3 GiB

   #umount /docs
   #e2fsck -f /dev/vgfiles/lvdocs
   #resize2fs /dev/vgfiles/lvdocs 3G
   #lvreduce -L 3G /dev/vgfiles/lvdocs
   #mount /docs

   The order matters: file system first.

3. 3How small can it get?

   #resize2fs -P /dev/vgfiles/lvdocs
   Estimated minimum size of the filesystem: 140326

   In blocks (usually 4 KiB).

4. 4Shrink to the minimum

   #resize2fs -M /dev/vgfiles/lvdocs

   Before copying to a smaller disk.

5. 5Show progress

   #resize2fs -p /dev/vgdata/lvweb

   For big file systems.

6. 6Grow a partition-based ext4

   #growpart /dev/vdb 1; resize2fs /dev/vdb1

   After the disk was made bigger.

7. 7Easier: let LVM do it

   #lvextend -r -L +1G /dev/vgdata/lvweb

   Calls resize2fs.

8. 8Undo file for safety

   #resize2fs -z /root/resize.undo /dev/vgfiles/lvdocs 3G

   Restore with e2undo if something goes wrong.

9. 9Check after resize

   $df -h /docs

   The new size.

10. 10Mounted shrink fails

    #resize2fs /dev/vgfiles/lvdocs 3G
    resize2fs: On-line shrinking not supported

    Unmount first.

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