Your NetApp volume is at 85% and all is well right? What about inode usage? Don’t forget to monitor that and increase it as needed. Don’t set it too high, because inodes take up space, and you can’t shrink the number of inodes. If you do run out of inodes, you will get an autosupport, but until you provision more inodes no writes can happen on the volume. Use the maxfiles command to see how many you have as well as to increase the number.

toaster> maxfiles vol1
Volume vol1: maximum number of files is currently 35999995 (35056570 used).
toaster> maxfiles vol1 37000000