dasd-eckd.4dfdcd <bus ID of the DASD>: High Performance FICON disabled
Explanation
High Performance FICON (HPF) has been disabled. Either the device
lost HPF functionality, or none of the remaining channel paths are
HPF capable.
User response
Report the problem to your support organization.
Ensure that the cabling between the storage server and the mainframe
system is securely in place.
Reset the device and channel paths by writing "all" or a logical path mask
to the path_reset sysfs attribute of the device.