dasd-eckd.637cf1 <bus ID of the DASD>: Reading device feature codes failed with rc=<return code>
Explanation
The device feature codes state which advanced features are supported by a
device.
Examples for advanced features are PAV or high performance FICON.
Some early devices do not provide feature codes and no advanced features are
available on these devices.
User response
None, if the DASD does not provide feature codes. If the DASD provides
feature codes, make sure that it is working correctly, then set it offline
and back online.