Linux show 133% disk space usage

We just pulled a new Linux server into Orion NPM and this is what shows up.

Linux shows:

Filesystem      Size  Used Avail Use% Mounted on

/dev/md1        910G   26G  838G   3% /

udev             16G  4.0K   16G   1% /dev

tmpfs           3.2G  832K  3.2G   1% /run

none            5.0M   16K  5.0M   1% /run/lock

none             16G  152K   16G   1% /run/shm

/dev/md2         17T  420G   16T   3% /logdata

Help Plz