[CentOS] VM disk question

Fri Oct 21 12:47:45 UTC 2016
Jerry Geis <jerry.geis at gmail.com>

Hi Barry,

It is an XFS file system.

I ran the command:
xfs_admin -L "/" /dev/sda1

and it says /dev/sda1 contains a mounted file system.
fatal error.

Now what?
Thanks

Jerry