https://blog.csdn.net/jianyi7659/article/details/49818815
Linux磁盘扩容LVM
【解决报错】Bad magic number in super-block while trying to open /dev/centos/root Couldn't find valid filesystem superblock.
背景：
resize2fs /dev/centos/root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/centos/root
Couldn't find valid filesystem superblock.
解决办法：
xfs_growfs /dev/centos/root
/dev/mapper/centos-root on / type xfs (rw,relatime,attr2,inode64,noquota)
文件系统是xfs
需要xfs_growfs而不是resize2fs。