Martin J. Green said... |[root at agw01 nagios]# /usr/libexec/nagios/check_disk -w 85% -c 95% -p /dev/hda1 You have it backwards. You need to use the % available, not the % used. So you want "-w 15% -c 5%". Not sure about the other problems, but that's why it says critical; you have less than 95% left on your disk. 8^)