MOnitor disk space on Sun Solaris

[Theo Bogatsu]

Hi I'm trying to monitor disk space on my Sun solaris server, I want it to give me a warning when it reaches 80% usage and critical when over 90%. I have used the below plugin:
check_disk
with these arguments:
--w 20% -c 10% -p /opt/
But on the status information I get a:
DISK OK - free space: / 128187 MB (93% inode=98%)

I'm expecting to see output similar to the output of df -kh (when run on the server) which currently is:
Filesystem                      size   used  avail capacity  Mounted on
/dev/dsk/c1t0d0s5       19G   6.8G    12G    36%    /opt

So in essence I think there should be like 64% free disk space?? Please HELP.

Regards
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