Hi Jad,
Thank you for your answer, here is the output:
[root@centos65 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/os-raiz 15118728 8879132 5471596 62% /
tmpfs 508160 8 508152 1% /dev/shm
/dev/sda1 247919 72594 162525 31% /boot
Maybe the problem is: os-raiz ??
Thank you.
Michael.