root@adrenalin:~# xfs_growfs /
/dev/root: No such file or directory
Usage: xfs_growfs [options] mountpoint

Options:
        -d          grow data/metadata section
        -l          grow log section
        -r          grow realtime section
        -n          don't change anything, just show geometry
        -I          allow inode numbers to exceed 32 significant bits
        -i          convert log from external to internal format
        -t          alternate location for mount table (/etc/mtab)
        -x          convert log from internal to external format
        -D size     grow data/metadata section to size blks
        -L size     grow/shrink log section to size blks
        -R size     grow realtime section to size blks
        -e size     set realtime extent size to size blks
        -m imaxpct  set inode max percent to imaxpct
        -V          print version information
root@adrenalin:~# xfs_growfs -t /etc/mtab /
meta-data=/dev/md/1              isize=256    agcount=45, agsize=3449690 blks
         =                       sectsz=4096  attr=0
data     =                       bsize=4096   blocks=155236032, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=1
naming   =version 2              bsize=4096
log      =internal               bsize=4096   blocks=16384, version=2
         =                       sectsz=4096  sunit=1 blks
realtime =none                   extsz=262144 blocks=0, rtextents=0
data blocks changed from 155236032 to 232854048
root@adrenalin:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md/1             889G  543G  347G  62% /
/dev/sdd1              67G   22G   46G  33% /crap
/dev/md/0              92M   16M   71M  19% /boot