The Problem
On CentOS/RHEL 6, an LVM volume group size has been extended and an attempt to do online resize of ext4 filesystem on LVM volume group failed with following error.
resize2fs /dev/mapper/P05TRF1vg-vol_controlm resize2fs 1.43-WIP (20-Jun-2013) Filesystem at /dev/mapper/P05TRF1vg-vol_controlm is mounted on /controlM; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 resize2fs: Permission denied to resize filesystem
The Solution
A file system inconsistency blocked the online resize of the disk, which can be observed in the messages as logged below:
--message-- kernel: EXT4-fs warning (device dm-1): ext4_resize_begin:32: There are errors in the filesystem, so online resizing is not allowed
--dmesg-- EXT4-fs (dm-4): warning: mounting fs with errors, running e2fsck is recommended
Since the file system is in an inconsistent state, a file system check is required for this affected file system, so online resizing is not possible and the file system has to be unmounted.
1. Umount the file system.
# umount /controlM
2. Perform a file system check.
# e2fsck -y /dev/mapper/P05TRF1vg-vol_controlm
3. Resize the file system.
# resize2fs /dev/mapper/P05TRF1vg-vol_controlm
4. Remount the file system:
# mount /dev/mapper/P05TRF1vg-vol_controlm /controlM
5. Check if the file system has been resized.
# df -h
Note: You can refer “man e2fsck” if you want to know more about this command.
# man e2fsck