resize2fs Bad magic number in super-block while trying open

You may get an error as below when you are trying to resize a logical volume on linux. Even after you extended the filesystem using lvextend. But when we do lvdisplay it will shows the correct size as you extended, but we will be getting an error as below.

[root @linux ~]# resize2fs /dev/centos/root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root
Couldn't find valid filesystem superblock.

Possible reason is, the mounted filesystem would be XFS filesystem. SO resize2fs wont work for xfs filesystem, we should use xfs_growfs instead of resize2fs.

[root @linux ~]# xfs_growfs /dev/centos/root

Lets do a final check.

[root @linux ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 115G 7.0G 108G 7% /

Hope this post is useful to fix the error "resize2fs Bad magic number in super-block while trying open"

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resize2fs Bad magic number in super-block while trying open