This is for OCUM 9.7. I don't have experience with 9.8 yet but I expect it'll be pretty much the same.
I set up 2 alerts under Storage Management/Alert Setup, configured like this:
Alert Name: Vol Inodes Nearly Full
Resources: Include "Cluster", Selected Resources "<< All Volumes >>"
Events: Selected Events "Inodes Nearly Full"
Actions: Select actions appropriate to your circumstance
And an Alert Name "Vol Inodes Full" that is identical except that under the Events page the Selected Events is "Inodes Full"
I decoded to set mine up separately in case I decided to take different actions for each circumstance, but if your action is the same then just configure one Alert and select both Selected Events.