OMSA is showing one of my physical drives as Ready and Spun Up. It has the yellow warning icon next to it. I have not looked at the server physically yet. I'm wondering if I can use the Available Tasks option to Assign a Global Hotspare?
Yes,we can assign Global Hotpsare when the physical drives is in ready state.
note that Only hot spare and unconfigured disk can be in spun down state if there is no activity on the drives for a specified interval of time.
For warning icon,Check on OMSA alert log page and see any clue on the issue.
between share the storage controller,server,drive vendor details with driver/Firmware details.
Also see that there should not be "predictive failures" on the Physical Drive attribute.