Restart the application server.
A Red Hat4.8 application server may fail to respond when loading a driver. The same symptom occurred when it was interconnected with a peer vendor's storage device.
It is concluded that an Red Hat4.8 inherent defect led to a not responding application server when the application server attempted to load an HBA driver after the driver had been uninstalled.
Do not unnecessarily load or uninstall drivers to or from application servers. Restart the application server if it is not responding when loading/uninstalling a driver.