dasd-eckd.a4325c <bus ID of the DASD>: FORMAT 0 - Reset Notification
Explanation
A system reset or its equivalent was received on an interface. The Unit
Check that generates this sense is posted to the next channel initiated
selection following the resetting event. This is an operating system
independent message that is issued by the storage system.
User response
For more information see the documentation of your storage system.