I am trying to resize a logical volume on CentOS7 but am running into the following error:

resize2fs 1.42.9 (28-Dec-2013)resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-rootCouldn‘t find valid filesystem superblock.

solution:

After a bit of trial and error... as mentioned in the possible answers, it turned out to require xfs_growfs rather than resize2fs.

xfs_growfs /dev/centos/rootdf -h

ref: http://stackoverflow.com/questions/26305376/resize2fs-bad-magic-number-in-super-block-while-trying-to-open

resize2fs: Bad magic number in super-block while trying to open