- A created partition that you know the name of. To check the name, run cat /etc/fstab. The first field is the name of the partition.
1. If the partition the file system is on is currently mounted, unmount it.
~]# umount /dev/vdb1
2. Run fsck on the unmounted file system.
~]# e2fsck /dev/vdb1 e2fsck 1.41.12 (17-May-2010) Pass 1:Checking inodes, blocks, and sizes Pass 2:Checking directory structure Pass 3:Checking directory connectivity Pass 4:Checking reference counts Pass 5:Checking group sumary information ext4-1:11/131072 files (0.0% non-contiguous),27050/524128 blocks
3. Shrink the file system with the resize2fs /dev/device size command.
~]# resize2fs /dev/vdb1 200M resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/vdb1 to 204800 (1k) blocks. The filesystem /dev/vdb1 is now 204800 blocks long.
Accepted size units for file system block sizes are:
S - 512 byte sectors
K - kilobytes
M - megabytes
G - gigabytes
4. Delete and recreate the partition the file system is on to the required amount. If the file system is smaller than 2TB use fdisk as is described in How to Resize a File System with fdisk, if the file system is larger than 2TB use parted as described in [LINK TO COME].
5. Mount the file system and partition.
~]# mount /dev/vdb1 /ext4-1
man resize2fs – man page for resize2fs that contains information on what resize2fs is, what it supports, and the various options it takes.