Resource Group state monitor- Available storage is in critical state

Hello,

I am monitoring a cluster of 2 nodes with SCOM 2012.

One of the nodes in that cluster is currently shutdown.

I can see that the server and all its cluster resources are in gray state - and that is OK 

But, Why do i see that the Resource Group state monitor- Available storage in a critical state on the working active node?

Is it related?

Thanks.

TechNet