[CentOS] tune2fs: Filesystem has unsupported feature(s) while trying to open

On 04/22/2016 01:33 AM, Rob Townley wrote:
> tune2fs against a LVM (albeit formatted with ext4) is not the same as
> tune2fs against ext4.

tune2fs operates on the content of a block device.  A logical volume 
containing an ext4 system is exactly the same as a partition containing 
an ext4 filesystem.